Retention Department

I need help with my Internet Billing, I spoke with an agent Last Month and thought we had resolved the issue but today I saw my next months billing amount and nothing has changed. I just spent 2 hours chatting with 4 different agents that all escalated or passed the buck to someone else. Each transfer was to a Supervisor yet they all repeated the same script. This has been very frustrating and forcing me to shop for another provider. AT&T is my phone service provider and have some good deals available.