being double billed

I app**** for a new telkom uncapped LTE service in early sept'15, as it was on promotion with very limited availability.I app**** on line and was successful (was given an ord no) <br> On placing order with sales person, i asked what will happen with me current lte account, i was informed account will be cancelled and new order will replace it.My bank account was debited 2 days(12/10/15) later for first month's subscription. i was phoned 2 weeks later to confirm delivery and was told my next bill will be reduced by debited amt.New modem arrived on 29th Sept'15, and was activated on 30th sept.2015.On 2nd october'15 i received my October bill and to my horror, i noted was being billed for old and new contract, itemised billing (which i didn't request) and no credit for advancing billing.i called on 2nd oct'15 to rectify bill to no avail. it took 3 calls and 7 people before i spoke Lusana who give me a ***, but couldnt rectify as Nomsano had to be consulted as she created order. I promised my call will be escalated and i will be called soon. I called in 5 days later and was given another *** for billing query. Its 18days later and my query is unresolved