FNB Worst Service Ever

I'm fed up with FNB got an Business account with them. I've bought stuff meat at a store and the card machine throwed out an error, so the cashier said we must try again so that amount of R762.00 went off twice went back showed the lady it went off twice. Talked to manager he said I must go to fnb and file an dispute by them this happened on the 8th of February 2021. I've phoned FNB they send me the dispute form filled it in and send it back on the 11th of February 2021. Got an Ref number and emailed said it will take 5 to 7 working days. With several calls to fnb customer care there is no luck. Its April now and no one phoned me back or emailed me to tell me what is going on. So now i want to change my bank because there is no service at fnb banking. Its the worse service that I've experienced in a long time. Will not recommend them to any one. Since February I've made over 8 calls to them to find out what is going on and everytime they tell me they send it to these guys. And it looks like nobody is working in fnb to sort out this dispute