Incorrect Billing- BAD CREDIT RECORD

I tried to apply for a credit card and was turned down due to a bad credit record, I drew a credit report on transunion, which indicated that I was in bad credit with Autopage. I had a contract with Autopage which at the end of the contract I converted to prepaid in Feb 2015. The credit report shows that my account was paid up in Feb 2015 already and OK for March and April however in May it shows 30days in arrears, June 60days, July 90days, Aug 120days, Sept and Oct 150days in arrears. How is this possible if my account was paid up in Feb and the phone converted into prepaid? Had there been an outstanding balance, why then did I not receive a statement? I called Autopage, spoke to 2 consultants and they verified that there is no balance owing and not sure why this will show on transunion that I am in bad credit. I requested a letter and documentation from Autopage to confirm that this account is paid up and for transunion to correct my credit report. ***. This was done on the 11/11/2015, today is the 16/11/2015 and I still have not had any feedback from Autopage. When I tried calling them twice today the call gets cut in the middle of the conversation.