Refund and pathetic service

Ihave been waiting sins August for a problem to be solved. Firts it's vaulty devices, then I am billed for the devices that was sent back 2 days after receiving them. Now I am waiting for a refund on that bill. I took a new contract for new devices, it was said that I don't need to make arrangements for money to be in my account the debit order fot the pro rata and activation fees will be taken from my credit on my VODACOM ACCOUNT. After I was notified by my bank on the 18th Of September that I have a very large NEGATIVE AMOUNT IN MY BANK ACCOUNT I phoned to make arrangements for the credit amount the be refunded to my BANK ACCOUNT. It was said it will take 5-7 working days for the refund to be PAID into my bank account. On the 25th I phoned again and it was said it takes 7-14 working days to be PAID into my BANK ACCOUNT. I can't pay my other bills due to this matter and Vodacom is not coming back to me about this matter. I will never take another contact with vodacom. They are very fast to debit your account but when it comes to resolving the problem and REFUNDING they are pathetic!!!