constant Top up payment failure

[JN47]

I have tried to top up using my debit card twice - both declined. I have tried two credit cards from different banks - both declined. I have checked with Barclays who say my cards have never been declined and say the problem must be with the O2 website.

[Enlli]

We are all customers here 

Best you contact 4445 or use one of the methods in this guide

Guide How to Top Up (PAYG)