haven't received refund after being billed incorrectly

Four weeks ago went to engine in Soshanguve Block G to pour petrol in my car .I used my card to pay R 1000 payment Then I realized that the petrol attended billed me R 10 000 instead of R 1000 . We notified the manager (Lizzy) that was in charge .She said she will reverse the money as she also saw the mistake that the petrol attend did.Till today she has not yet transferred my R 9000 00 back . One day she called me I spoke with her while her father was lestening so that he can also understand what happened When I call her I get the stories of I have paid it will reflect into your account in 3 days or I am going to the bank going to pay it into your account just now.I got fed up with her stories then I phoned Engine head office ref number is ********** last week Tuesday the feedback I received was that she promised to deposit my money into my account and will reflect into my account Friday (24 May 19) . But still no money into my account . I notified Engine that she hasn't paid me yet. They said they send the regional manager to follow up because when they are also struggling to get hold of her and it seems like she knows that Engine will not act on what has happened .The way I see it another four weeks will end without me being paid. I just need my R 9000 back .