Vodacom not refunding my credit into my bank account

I have a credit on my Vodacom account, which I have been asking Vodacom to refund into my bank account. I have been making this request and every time I call them. I am told it takes 10 days to reflect in my account. They have already opened 4 service requests but it seems they are just winding time by debiting from this credit. There is absolutely no customer care.