I can't add prepaid credits to my account, because whenever I try, they try to authorise a zero balance transaction, I approve it but my bank then rejects the r

I can't add prepaid credits to my account, because whenever I try, they try to authorise a zero balance transaction, I approve it but my bank then rejects the real value. This happens across two banks. But that's a good thing, I have come to rely less on their agent and use the competition more.