eBucks card worthless

Once again I am unable to use my eBucks card. I phoned the Call Centre again today. First Sibongile wouldn't let me speak and kept talking over me, so I asked to speak someone else. So I spoke to Phindile. She told me that I used the incorrect pin. Which I most certainly did not. I am not going to divulge why it could not be incorrect (that would give clues to what my pin is), but it is a number I most certainly would not forget for several reasons. How can it be wrong every single time? And I just got an sms from eBucks while I was on the phone with them to confirm that the pin is the one that I used. Phindile refused to entertain any other possibility for the card being declined again. What is the point of even having an eBucks card if I am unable to use it? The only thing my eBucks are good for are for airtime and electricity. I have a contract phone and I do not have prepaid electricity. So it is virtually useless to me if I cannot use it to purchase fuel. Apparently Phindile is a manager there so I guess I won't be able to get any help at all. The previous time at least the gentleman I spoke to tried to be helpful. I was very happy after that call, until I tried to use my card again.