USELESS SERVICE FROM CUSTOMER CARE

We contacted MTN on or about 14 September to cancel contract (R79.99 per month) and to change to pay-as-you-go. They informed us of a deal of R40 per month for 10gig data per month, which we accepted. However when the monthly bill came for September the invoice stated R378.99 per month. MTN customer care was contacted early last week about this. They confirmed that the sales person sold the R40 deal to us but that another department will phone us back to rectify the problem. Gave us a reference ********** 61. On Monday 6 November we phoned MTN again. Again they said that someone will phone us back. Still nothing. You have to hold the line for 808 to answer for more than 45 minutes every time. This is unacceptable, poor, useless service. I want my refund and I want the contract cancelled immediately.