Horrible and Disgusting customer service.

Hi.

June 27th (if not mistaken) I took out a apple mac contract via Telkom at The Glen istore. I was told i will only be billed end of July, that is, pro rata for June and full charge for July. To my shock, end of July i was charged full month of June and full month of July. I then called them and logged a compliant, they advised they will get back to me within 4 hours, which they did not because it was not a sale. If it was a sale they would have called me back in 4 seconds. I then went to Southgate telkom store, where they then told me to use their phone and call the call canter again and I was also advised that they will call me back, and guess what? they did not call me as expected. I then went on my app on the phone and disputed the invoice. Then i was only charged 1 full invoice of R1100 but i do not know for which month as i was charged for both June and July. I then checked on my app only to find that the double invoice is still reflecting as not paid. Till today i am still waiting for them to call me but instead of getting a call I just got a declined debit order which will then affect my credit score and result in bank charges for me. This horrible customer service is really affecting my finances and my image and I need this resolved or the contract cancelled.