If I didn't know better, I would say I'm getting shafted by the internet companies

I was just getting my Spectrum to $50 and now I see the deal has expired so they want to be $70 after the promotion is over. I can get a deal for AT&T for $40 but it will be $70 after that expires. I can get Earthlink for $39 a month and it won't be $70 after the promotion expires...it will be $92 a month! If I didn't know better, I would say I'm getting colluded upon.