Unknown Data Charges no feedback Autopage

Since October 2014 I have send emails to customer service regarding unknown charges on my company cellphone account to the amount of R3700 with no constructive feedback. I have received no feedback from Autopage, and they can not proof that the charges belongs to our company. The charges only occured in October and November 2014, but since I complained suddenly our data charges billing is correct again... but now they want us to pay the unknown charges without any proof. The data charges was on one cellphone only but they suspended the whole company's services. If you phone Customer Service, they refer you to Accounts department, if you speak to Accounts, they refer you to Customer Services. Autopage is running away from the issue and the customer must just pay up. I have all the proof of communication between the parties... sms, email, fax, call centre references etc... but no supervisor or manager contacts us to solve this problem.