FNB: CLOSE MY PREMIUM ACCOUNT

I contacted FNB via APP requesting for my accounts to be closed except of funeral cover, they were provided with the new banking details for funeral cover debit order. I needed to close my premium account as I am no longer be able to maintain the bank charges of R600 per month due to being unemployed. Bearing in mind I was sent a message that it'll take 3-5 working hours. Today 16th July, I contacted them via the app again for follow up, now I am being told I am under debt review so they cannot close the account as if I owe them on the savings account. I am not under any debt review and where they get their information puzzles me. All they needed to do was to check with credit bereaus, so unfortunately for them when they attempt to debit my account there wont be any funds available. and I'll hold them liable. Their consultants have not been trained efficiently, information is always different from one to the other. Please fnb close my premium account with immediate effect.