Disgusting service from Multichoice.

Disgusting service from multichoice. I accidentally paid them R9000 instead of R900. I’ve given them proof of payment plus my bank statement so that they can reimburse. They are using every delay tactic not to pay. I’ve even called and they gave me reference ***I20 where they confirmed R9000 was paid on 1 March. Multichoice say that they don’t see this. This is an absolute awful tactic to keep the money. Are they that desperate for cash.