Unacceptable Service and Deactivation

Hello, <br> <br> I have been on contract with cell c for 4.5 years. I suddenly have no service and cannot use my cell c mobile. <br> Mistakes keep happening with my billing and I keep calling to rectify, because my account is always in advance, but no notes are made on the system. I have sent proof of payment for each EFT numerous time and they are still unable to resolve the issue. <br> <br> I have spoken to am agent in the contact centre and been advised yet again that NO NOTES HAVE BEEN MADE ON THE SYSTEM and they cannot assist<br> <br> I am really concerned and I need this resolved immediately.<br> <br>