GO Mobile can't pay to upgraded to unlimited miles?

Unknown

Have tried every thing for tom tom to take money off me to upgrade to unlimited miles on go mobile, but always get the same message transaction declined. The one click pay comes up on page but every time I click comes back with same message,
Can you pay direct to tomtom for this service or do you have to pay online?
Any ideas would be welcome.

davids0865

If you are trying to do this on a tablet without a sim card, that is why. I have the same problem, I downloaded the app and map on wifi then when I try to upgrade it seems to want a direct data link. Don't know how to overcome this, but thought I would post in case you're in the same position.