WHY DO YOU NOT WARN YOUR CLIENTS

I did transaction on OLX via moneygram which was a **** and I lost R11 000. When I phone FNB Forex I was told that that happens a lot with FNB clients where they where asked to pay courierm costs via Moneygram and that moneygram was only to be used for people you know. When i first went to register for moneygram why did the Women at sales and services not tell me moneygram is only for family and friends she could se the surname was totally weird and not family of mine. Also whey do FNB not sent out emails to all there clients warning them about the **** if it happens often?? That is what ABSA does. Thanks FNB !!!!!