Credit card stopped without warning

I have a additional credit card on my FNB account for my wife to use. I received a sms asking to submit a copy of a ID document to a email address, which looked a lot like a **** because it stated as previously communicated and I have not received any previous communication from the bank, so I ignored it because I can't submit personal documents based on a sms sent to me. FNB sends out all the warnings about ***** and ****s, so I was sure this was a **** to get personal information to commit *****. I never received any follow up phone calls or communication from the bank. A month later the credit card just got stopped without any warning from the bank. Phoned them and they said it was stopped because they sent me one sms to submit a ID and that was it. Is this really FNB's way of doing business?? SMS'ing clients to submit personal information? How safe is this after seeing ***** and identity theft happening on a daily basis. FNB will not see me for much longer. Spoke to people on Investec who only gets the best client service and their interest rates beats FNB by miles!!!

Etzard Grimbeek