Monthly bill went up

My monthly bill went up by 20 dollars most likely because the contract I had expired. I was wondering why I was not notified ahead of time of the expiration. I tried to see if I could sign up for a new contract myself for a better monthly rate, but there were no offers. Can anyone help me get a better monthly rate please? I would accept lower internet speeds if I could, but as far as I know I'm already on the lowest tier for that. If I cannot get a better rate, I may have to cancel service.