FTTH Billing issue

Pathetic service.

We have been struggling with our fibre to the home since last year september. We upgraded the package to a 100mbs line and were told it would be 949 however, since then we keep getting a bill of over 3000. We have been pushed from Pillar to post from sales to billing and no one is able to assist us. No one knows how to resolve this issue and we are in desperate need to get it sorted as our services are currently suspended again. We have been referred to a lady by the name of Vuyokazi Mazonda however, she is never available to assist with this issue.