No response regardless of promises!

At the beginning of this year I decided to change my ADSL to LTE from Telkom. Got all the details, new router, and LIT Tv box, which i ordered online from the Telkom Website. The salesperson explains to me that the first bill will be higher because the debit order will only go off at the end of Febraury as January had already gone in a few weeks (can't quite remember)or so, which I understood. The contract I took out was supposed to include the LIT option on the subscription I chose bringing to the total to R789. After the first month my data went up quite quickly and i enquired about how the LIT works etc long story short I ended up calling the call center finding out that even though I specified the LIT option and paying for it it was never included to my subscribed services - this was then corrected. Ever since my bill has never been R789. I've never gone over my allocated data usage, nor used the out of bundle rate. My end of March will was the only bill that was correct. End of April my bill ends up being R1210.07, which I queried and no response received I received an email with my May bill R1275.35 I queried this on the 14 May and was told that someone will contact me within 72 hours. NOTHING!!!! I follow up on the 21 May and was promised that it will be looked at by end of business that day or early the following day and STILL NO feedback with regards to the extra charges on my bill for both April and May. Now you end up not paying that bill and get labeled as a bad payer by financial institutions. I need answers and a resolution to my queries as the month of May is soon reaching it's end!!!!!