Fnb Fusion account

So I had a Fusion account with FNB , I got retrenched during COVID , I went to the branch and showed one of the consultant as I asked cant they freeze the account she then said there's nothing they can do. I then tried paying R250 each month but I only noticed that instead of It decreasing it was increasing so I then stopped paying . Then later on think around 2023 I started paying R500 into the account late last year my account was closed and there was no communication from fnb on why my account was closed and later I find out that I was handed over to Nimbles attorney, since laste year October I would go to the branch to sort this matter cause nimble kept on saying they don't have my account, now some consultant said a Fusion account cannot be handed over I was shocked also , so my trip to the branch was from October till February 2024 I then stopped going cause there was no way forward regarding my account now my question is who needs to pay all those interest added I'm willing to pay but not the interest cause it's not my problem, my account got closed without any communication, no call nothing till I went to the branch ... someone from legal from Fnb needs to call me and explain how does all that happen cause by now I would have finished paying the account...I don't anything to do with fnb anymore its a ****ty bank that can't treat they client with respect