Unable to checkout on an online order

[SWhitts73]

Good evening,

I'm attempting to checkout a mobile phone and SIM order online, but all I get is this message:

"What if I pay by card?

If you pay by credit card, please call our contact centre on ***********"

(I'm not allowed to type in the number on the forum).

Does anyone have any ideas on this? I have cleared the cache, rebooted and reinstalled the app but with no joy.  

[caesarome]

@SWhitts73 

Have you called the said number if that applies to you. An alternarive would be to pay by a direct debit.