Upgrade to Fusion Account Bad Move

My account got upgraded to a Fusion account telephonically then I was told that it's linked to a credit card instead of an Overdraft. 2 weeks down the line I discover that I owe Fnb 9k which I had no idea because inbetween all this mess I was transferring funds from my savings to cheque. Till today I did not get an explanation when and where that 9k was used.

Today 20/03/2021 I decided to go downgrade this **** account at Horizon. I was assisted by Xolani Nkosi, so due to my frustration and losing money that I didn't budget for by paying for this overdraft I told him that I'm done with this bank coz it's **** service then he tells me that he will stop assisting me if I continue being rude. Firstly I was **** to as a customer, secondly is it not their job to keep a customer happy at whatever cost? So I've decided I actually don't want to stay with Fnb anymore.