O2

Hi, I have been trying to TOP UP from MY 02 account, but it will not let me from my credit card, which I have done so for many years. It says I cannot do it. I have tried from your chat line but it keeps saying I must do it by phone. I want to do it ...

Why can I not pay by Mastercard? It says I can.When I press pay, it goes red and says " This card is not accepted "