Disgusting Service from Cell C Fibre Support

Ugraded Cell C Fibre Contract and did not realise that there was a debit order on new contract, so we were still paying installment onto old (closed) acc and were never informed that Cell C closed that acc. Contacted support on 2 Oct and what should have taken 7-14 working days has now been 30 days + and still nothing done to refund our double payments. Made various calls & emails back and forth and all they have is excuses and takes a week to respond to an email. Even spoke to Team Leader of Support and still no joy!!