Lack of Customer Care

I switched my cell phone contract through Autopage in November 2014 through an agent telephonically. Since then I have been grossly overcharged and not a single person from Autopage has got back to me on any of my issues. I have no idea what the status of my contract or account is. As if that's not bad enough they keep cutting my sms or data or call abilities. Please please please can someone help me. I'm desperate to resolve this matter. I have all details of my correspondence via phone and email etc as well as my signed contract.