Debiting my account without my consent and without even having what I am debited for

So in October 2020 I app**** for a FNB In Contact sim card, they could not deliver it as I was out of town and then I received a message to state that it has been cancelled. So they keep debiting my account and then this month I saw they keep debiting my account with R399.00 but I have no sim card and even on FNB'S system it shows that I have been notified via sms that it was cancelled. Yet they keep on debiting my bank account. So when calling FNB In Contact today I was advised that someone will contact me within 24 to 48 working hours. And when asked how long it will take for them to refund me for the months they haf taken money out of my account without my consent!!!! She rep**** and said 21 working days. I am fuming and find this behaviour unacceptable, and I am gonna close all accounts that myself and my wife have with FNB!!! We have been FNB clients for MANY years and find this attitude and the way this is being handled to be appalling