Paying for a service I do not have

In November last year I changed address. Upon advice I signed a contract with Telkom Mobile ( 8-ta ) for internet.<br> They assured me that there was 3G reception in my new area. I found that there was no reception.I reported this<br> to them and they send a technition who confirmed that there was no reseption. I then asked the Ballito Branch to <br> cancel the contract and rather install a ADSL Router,which they did and I was satisfied.<br> Then the invoices start arriving. I complained to the shop but they told me to contact Telkom as there was nothing they could do. I contacted them numerous times but every time they just ''upgrade'' my complant. Last week someone from their organization phoned me telling me that they will now close the case. Today I found that they drew another R 598.00 from my bank account. This means with this amount plus the R 788.00 for the contract I have now paid R 1386.00 for a service I never had!! There was also some mothly payments of R 299.00! I have now enough of this!! Please advice on what to do