Still no satisfaction

I've had a query with Vodacom since 19 April 2015, on 10th July, I put a complaint on hellopeter, the same day Lesley called, I explained whole query to him, he informed me that a credit would be done on my acc by the following Wednesday and a refund, to me would be done within 7 working days, sms was received on the Thursday confirming that the credit was done, day 8 today, still no funds paid back to me. Yesterday I spoke to a Silvia at customer care, very unhelpful, I explained to her situation, she wanted to log another query, told her I did not want another query logged, I would like my money owed to me, after holding for 10 min, she returned to inform me that she has put a request thru, someone will call me back within 1 working day, from previous experience with the customer care centre, the just close the queries, without calling the customer back. so what does a person need to do, to get a query sorted out and for Vodacom to keep to their promises of time limits to respond times. You cant complaint about their service as there is no service from Vodacom. I've had it with them Vodacom.