Capitec disloyal to its clients

Capitec claim that there's a R58 that come in to my account they decided to close my account due to that R58 that i have no idea where it come from, i dont even have any proof from the bank regarding the matter, they told me to submit Id copy and Affidavit due to this amount of which on that affidavit i indicated that they take that amount to whoever claim he/she send it to me back to them then open my account. And i was gavin 48hrs from friday the (24/03/2023) till today 29/03/2023 nothing has happened to my account, when i go to the branch they claim my account is still under investigation till this day from the day i was aware of this issue on the 22/03/2023 i have money in the account that is locked there due to R58 that i have no idea or even trace of it. Really capitec doesn't take good care of their client. I am suffering for what i have no idea and willing to pay it back if really it come in so that i can be able to use my account.