Bankroll Telkom Mobile

Pleas explain how your accounts section can continuously get it wrong. I have been with Telkom mobile since early days. 2 years ago when i did my first upgrade I got incorrectly billed for 6 months and had to keep paying my old contract amount which was much more. Eventually after 100 calls and 20 visits to the store I got refunded. Now another 2 years later another upgrade and I have to pay additional R350pm for a internet bundle of my previous contract. I have been told by your accounts section to pay once again and they will refund me. Now you have suspended my phone for refusing to pay this additional amount ! Why can this account billing be re conciliated you give me the correct amount owing and I hope this does not take another 6 months to resolve.