Charged before line was even installed.

I received an invoice from Telkom on 4th May 2015 for Uncapped internet for the following amounts:<br> <br> 13th April - 3rd May R175.62 excl VAT<br> 4th May - 3rd June R250.88 excl VAT<br> <br> My line was only installed and activated on 20th May 2015.<br> <br> I called the call center on 7th May to log the fault under ***. I was told that it would take 7 days to correct. I called again 15th May and this was still not corrected but i was told that it would be escalated and resolved. Today i just received a bill for the service which we have used from 20th May however the charges prior to that from 13th April are still appearing on the bill and have not been reversed yet. Telkom have also charged me interest for this amount even through i did not have any service from Telkom for this period. I am fed up with the incompetence. Telkom cannot sort out a simple billing query.