Overcharged on my credit card

I was overcharged by almost R1000 for a transaction on my credit card. Emailed ABSA twice already yet no response. Very poor customer service, backed up by attempts to de***** customers. I will not be accepting this, and will not settle the amount until ABSA rectifies their mistake by refunding my account. This is credit card *****. I will be reporting this to the ombudsman and other consumer protection bodies.