Unendless problems with my account

On tuesday night 4 Aug 2015 me and my husband was having dinner at a resturant in florida roodepoort Poterhouse. We had a lovely evening untill the bill came.The bill was R460 so we still had enough money in our account to pay for our meal keep in mind my husband logged into our account an hour earlier to dubble check the anount in our account and yes the money is still their. We decided to swipe our card to pay but it was declined TWICE!!! I sent my husband to the nearest atm to withdraw cash but also no luck. My sister in law had to bring cash to pay our bill. We left the resturant feeling very embarssed and we blame FNB for that!!!! We checked our balance again the next day and yes there is money in our account we cant use the money and we NEED that money to carry on our day to day living. I left Absa bank due to this kind of problem and now FNB is doing the same. I sent an email to customer service they rep**** saying they will contact me very soon its now almost a week back and no reply!!!