I (student teacher) accidentally gave my students an exam that was twice as long as it should have been. Now they are accusing me of botching the exam on purpose.

Here's the situation. We have a final exam for students in 6th grade, and normally, this is done with the kids in the classroom. This time, we distributed the exams to the students and let them take it at home. I was responsible for scanning the exams, along with all the other materials for their final grade, and sending them to the kids.<br><br>I have a bad habit of printing things out and giving them to the kids rather than electronically sending them. The exam was supposed to be 7 pages long, and I gave them the 7 pages, but I also included a bunch of other stuff, like formulas, flowcharts, and other extra materials that were not supposed to be included.<br><br>So, when the kids got the exams, they were shocked to see that it was 14 pages long. They did the exam, but now they're accusing me of intentionally sabotaging them by giving them a botched exam. They claim that I was just trying to cause them stress by giving them a super long exam with a bunch of useless pages.<br><br>I know I messed up, but I didn't do it on purpose. I just wasn't paying attention and sent them the wrong stuff. I apologized to the kids and explained the situation, but they're still mad at me.<br><br>How do I fix this situation and get the students to understand that I didn't intentionally try to sabotage them?