Revolving Facility at FNB

I've settled my revolving facility at FNB on the 19th October and also phoned them requesting them to close the revolving facility with immediate effect (Reference RP***). Last week I've checked my FNB banking app and noticed that the Revolving facility is still not closed and phoned them again asking what is hold-up on this. A friendly lady called Tembi, advised me they have escalated the request to the appropriate department for closing of the account and promised me that no additional monthly fees will be deducted from my account for this revolving facility. I've just noticed that they have deducted a monthly fee of R70 from the revolving facility and when I phoned in, the lady on the call immediately close my revolving facility without any hassles and then deducted the debit amount of R70 from my cheque account. She explained to me to close it, she need to clear the debit, but according to me the debit shouldn't be there from the first place as the account was paid up and they didn't render the service properly by closing the account when I've asked them on the 19th October. This is totally unacceptable as the account was already paid up on the 19th and why should I pay R70 for a debit which is not my fault. Can you please reverse these fees with immediate effect.