Dysfunctional cards

Over the past two months, I have had issues with my credit card declining. The first instance was at woolies who informed me that my card was listed as a hotcard. When I called the call centre, they said nothing was wring with my account. I left it at that. Then a week ago my card at Sports scene canal walk and it declined again. I subsequently logged a complaint on your website and got a call from Dumisane who apilogised and said that fnb had done something incorrectly but that everything was sorted. Yesterday I swiped my cheque card for an amount of R50 and it declined. I then had to draw money. When I got to the fnb atm, it was out of order and I had to use a Nedbank Atm. I am now too afraid to use my cards because I dont know what the hell is going on. I am not happy and am incuuring charges cause I am now drawing money etc. i want this sorted out or I am moving my account. This is ridiculous. I am not use to this poor service from fnb.