FNB disgusting Service

On the 2nd of April 2021 I saw a Notification about a R6521(purchase)from AVIS and I had my card in my possession,I tried to call FNB to reverse the money for me on the 8th April 2021 and they sent me a Dispute form which I had fill in and send it back to them(FNB) after I did that I received an email stating that the issue will be dealt with within a period of 5days and since from then I haven't heard from them,so friday I decided to call them again and still the issue has not been resolved still waiting for my money,FNB Service is terrible and disgusting