FNB *********** and concerning marketing practices

I was called from a person calling on behalf of FNB offering me a "product" and a gold checque account with great "options".

I declined and asked the lady how many accounts I have with FNB to verify if this was indeed FNB. Oddly enough they knew how many accounts I have. She got rude and abrasive and hung the phone up after muttering an obscenity.

My problem is this: Why would my bank offer me a cheque account when they should know I have one already? This is rather concerning and raises the question of trust and competency of the institution I trust with my money.