29-11-2014 09:33 AM
29-11-2014 10:26 AM
Can you try doing this on a different browser and/or device and see if that helps?
If not then I think you'll have to contact 48 support about this:
In the meantime you could topup your cash credit balance by voucher and then buy add-ons by text:
How do I top up? Overview of the top-up payment op...
Hope this helps.