No one at FNB knows how to help!!!

I am sitting with accounts on my FNB online banking that is accruing interest and I have no way of cancelling these accounts as everything is blocked and has been since 2020 Covid 19. These accounts has been inactive for 4 years and has now prescribed, no one can tell me who to contact to resolve this issue. One account is CBS Legal RI and another Undefined, then there is a cheque account, an easy account and a savings account all totaling R22 447.36.