FNB business private chat assistant

I have a business account with FNB and I normally notice a purchase I didn't recognize on my bank history of R79 referenced Middelburg tap and go. I was under the impression my partner was the one making a purchase there until he said he also is clueless about the purchase. I contacted FNB private chat to discuss and atleast get more clarity on the name of the store as I suspected maybe it might be a ****mers. Vuyelwa was the assistent assigned. Immediately after informing her/him of the issue at hand, she responds by please confirm cancelation of the card. Remember this is a business account with two cards and this assistant hasn't even done any investigation whatsoever but already wants to cancel cards. I asked her why she wants to cancel my card and she says "you don't recognize the purchase so there is nothing we can do but cancel the card". I informed her of her lack of investigation into my enquiry and that was when she requested me to verify myself. I saw no use in a person of that nature going anywhere near my account and I proceeded to inform her that I'm going report her incompetence. She answered with a "thank you for contacting us" automated answer. No apology whatsoever. FNB must do something about this Vuyelwa character. These types of begrudged tellers/assistant are the types that end up *****ing from our accounts or even adding extra unnecessary charges.