Disgusted in Telkoms service

I currently have 3 contracts with Telkom, one of which was missold to me and when I have tried to contact them to migrate to the appropriate package, they simply tell me I can't and want to charge me to cancel in order to set up new contract. Everytime I try and phone, I'm either waiting for long periods on end, only to be told I cannot help you and I've been waiting for a manager call back for forever. I'm on the verge of taking this further if the matter is not resolved as a matter of urgency. I'm beyond Dispappointed in Telkom. Kind regards Rebecca