AITA for telling my grandparents to pay me 10,000 for the week I spent with them?

My grandparents are quite wealthy, they've got a beach house, lakehouse and a big 6 bedroom home they live in. All three are fully furnished, they also own a winterhouse up in the mountains. I'm 22M and I have always been close to my grandparents but we don't see each other often because we live across the country. Before it was just my family going to visit them but when I got older I decide to go alone sometimes because we all have very different interests. So we had a trip planed for the summer (like we do every year). My grandparents were to pick me up on Saturday but I got a call from my mom on Thursday saying my grandparents crashed their car. Both of them are fine but they are really tired from the crash. Also they were supposed to get their other car the next day and now they will most likely have to wait two or three weeks until their other car gets fixed. They wanted to cancel our trip and I agreed. But then my mom says that they were thinking of sending me on the train but my grandparents didn't have anyone to go pick me up and their other car wouldn't be fixed until the next week. MY mom then says that my grandparents have a solution for this and that it would be a long drive to come and get me. I agreed and called my grandfather. He says that he has an uncle who lives only 10min from the train station. My grandfather assures me his uncle is fine with picking me up but he has to spend the night and then be dropped off at my grandparents next morning. I agree and he says he will send me the address. On the morning I take a taxi to the train station, with my suitcase. It's 6:30 and my train leaves at 7:30. I get my ticket and wait. The train comes 15min late so now it's 8:15. It's a 7hr long train ride. As I start seeing familiar places I know we are getting close. After 7hr and a half I get off and look around thinking where my uncle might be. I don't see him and decide to call my grandfather. He says his uncle left an hour ago and that I should be already with him but I am not. An argument starts and I am told to go to the bus station and take the bus and walk the last 0.8 miles (1.3 km). I do so. On the way walking I get a call from my uncle saying he's by my grandparents house. He says he was there on time and that he can't believe I wasn't there. I tell him it's fine. After a while I get to the house, I am tired from walking with the suitcases but I feel better once I am inside. My grandparents ask me how the train ride was but I say it was fine. They ask me to show them pictures from the train and the bus stop. I say I didn't take any but they keep asking me to show them and I get frustrated and say it was scary for me because my uncle wasn't there on time and I didn't know what to do. They say to let it go and move on from this but I don't want to and I keep complaining that I could have been kidnapped or something. They tell me to let it go but I go on and on about what could have happened until my grandma loses it and says " for fuck sake will you ever let us be". I get mad at this and go for a walk in the park. There I start thinking about what could have happened to me and how scary it was. After my walk I come back to the house and I go to my grandparents room. They are watching TV but they turn it off when I come in. I tell them that I will not spend the rest of the week on their house and I want to go home. They get mad at this and tell me I am being immature and that I will feel better tomorrow. I tell them I will not feel better if they don't do something about it and I will go home. My grandfather tells me to stop complaining but I keep going on about how I don't want to be there. They go back to watching TV. I keep going on about it but they say I am an AH for being this way. After a while my grandmother gets up and says she will go talk to my uncle and ask him to pay me for the week I spent at their house. I say 10,000. She asks if 5,000 is fine and I say it's not. She then says she will pay me and I don't have to wait for my uncle. After a while my grandmother tells me that my uncle says he will pay me 10,000. I go to pack my bags and my grandparents try to change my mind. I say it's too late and I already called a taxi and am going to the airport. After that I go to the airport and decide to spend 3,000 on a first class ticket. I get home on the same day 5 hours before what we had originally planned. My mom sees me and asks me why I am home. I tell her what happened and she says I was immature and she will call my grandparents to apologize and tell them I am sorry. I say I am not sorry and I don't want to tell them I am sorry and that I am not going to their house until they apologize and stop calling me immature and AH. Should I say I am sorry so we can get past this and I can go to their house. Should I not say I am sorry and wait until they apologize to me.