Fnb bank horrible service delivery for business account

I was so unhappy with the poorest service fnb gave us after loosing our business card. On the 20th of June I lost my business card unfortunately I was busy and I didn't get a chance to go and report the matter then on the 26th June early in the morning at around 03:00 am I saw a notification saying that an amount of R700 has been withdrawn by the tall gate so I went to the bank same morning and blocked the card and removed all the remaining money that was in there.however this money withdrawal by the tall gate kept on happening till on the 24th of July which was yesterday. My question is how come this thing keeps on happening even though the card was blocked.

To cut the story short last week an urgent from FNB called me saying this whole this has nothing to do with them and will have to pay the amount that kept on exceeding on the account which is R-11000 and she even threatened me to take legal action if we don't pay that amount.

So in closing This is one of the worse bank ever especially in the business account side.anyone who want to open a business account should go elsewhere . I wish there was an option of sending screenshots I was going to attach them here so you can see what I'm talking about