FNB not doing enough to protect my account from ********** activities

I was called 2weeks back by FNB telling me that there was someone who tried to do a transaction of over R11000 in my account and I was advised to block my card.To my surprise I blocked my card but am still getting messages that the same person is trying to access my accounts.I have blocked my card surely FNB should put measures for this person to not even make an attempt as now I am worried about what is going to happen when my salary comes in?Is it safe to continue with FNB?