Pathetic Customer Service!

Utterly disappointed with FNB Customer care centre. In January I noticed 2 debits go out from my account that I was unaware off. One for December and one for January of 2 different amounts. When I had seen this at the end of January I immediately disputed it and tried to reverse the funds. The smaller amount in December was returned to my account however the bigger amount had to undergo the entire dispute process. It is now September and it is still pending. My app shows that there was feedback received from the service provider however FNB needs to close it off. About 2 weeks ago I queried it again on the online secure chat and they advised that they had not received any feedback from the service provider and that they will escalate the matter. From then I keep hearing that I will receive feedback within 3-5 working days but no feedback has been received. When I queried last week the service desk agent advised that I should wait or alternatively call the service provider myself. I called the service provider only for them to say they cannot assist me and I should contact FNB again. Today I contact FNB again only for them to tell me that I will receive feedback again in 3 to 5 working days. I further went on to tell the agent that I have been hearing that for the past 2 weeks and if theres someone higher I could chat to. Again, she goes on to tell me that I can contact the service provider myself or wait. Pathetic service! Seriously considering changing banks as this is not the first issue I have had with FNB