Summer Mobile should not be contracted out by MTN, they have terrible customer service

I have had the exact same problem as some of their other clients. Someone phoned said I'm ready for an upgrade, I said I want to downgrade, so I decided to take the R299package. the salesman quoted a few figures, which I thought was fine, but at the end of September the correct amount went off, then in October when only R500something was supposed to go off - they took R1,000.00 then a few days later another R500+-, then at the end of Nov R600+ disappeared.....The one person with whom I spoke, was sort of helpful, but she could only escalate the matter.....this has been escalated now for two months..... if I call back... I'm told all they can do is escalate the matter further, and there is no way I can speak to a manager or someone in charge. This company should be closed down...MTN should not be contracting out to them.