Land Line and Mobile incorrect billing

Firstly my land line was cancelled 2 months ago - ********** 454 and i am still receiving bills. Secondly and worst of all my wifes contract was upgraded a 2 months back - ********** . The salesmen at the store said he would call a week later to cancel the one number as he couldnt do it over a weekend. After a month no call and we paid a bill paying for 2 NUMBERS and the contracts that are there arnt even the correct price. We where over billed by around R500. I now recieved another invoice for R1077 for JAN. My wifes Contract is only R229 a month and capped at R500 spend limit. I called in and theey said i must go to the store, i went to the store and they said i must phone in, TELKOM What must i do? I was told managers would call to help sort out and nothing has been done