Waiting three months to upgrade ADSL line.

We have app**** to have our 4meg ADSL line upgraded to 10meg line at the beginning of March on phone number ********** 700. Telkom phoned and said they can only upgrade to 8 meg which we approved. Since then we have been back to Telkom to inquire why the line is not yet upgraded. Twice they promised that it would be escalated, but now 3 months later we still had no joy and have not been upgraded yet.