Canceling my service?

I want to end my at&t service. My balance is at 0.00, I removed all of my information, and I removed autopay. Yesterday was the last day of my service, but I still have service?

Does it end on its own? I read people saying something about a 60 day wait time? Does that mean I have 60 more days of service without pay? I don't get whats going on.

I hope I'm not somehow going to be charged for this. Am I?

Am I missing something?

Thanks