DATA / ACCOUNT MESS BREACH OF CONTRACT

Having been a customer of Autopages for over 10 years I would have expected better treatment. I am only tackling one of my problems now. I upgraded my cellphone a few months back. I was assured that the bundles would be sufficient for my needs. The first month, by billing was slightly higher which is explanatory with a new cell phone and applications. Since then though by bill has gone completely haywire - almost 5 times what it was just a few months ago. A small increase was expected and agreed but not this. No one can give me a consistent reason for this despite my numerous calls and e-mails. I was given a credit with no explanation of how this was calculated. I want this resolved once and for all.