Poor service and no respond

I just to report Capitec Bank Tzaneen, I opened a bank account with them in 2013 and I wanted to buy some stuff overseas with my mastercard just to find out they did not activated my online purchase option, I recently activated and put my limit to a certain amount, after so many purchasing form internet I wanted to purchase on 30.04.2016 but no luck, it keeps on telling me "Payment Fail" I phoned customer care but there is no problem at the bank at all, so I am stuck can not purchase anything,so I decided to change my bank, no more Capitec