Hello there.
The Three website should always work in order to allow access to settings and allow the purchase of roaming add ons. If you had no access at all, the issue likely wasn't related to the fact you didn't have the needed allowance. It's more likely that there was an issue with the settings, either on the phone or on the account. If you're still abroad, I'd recommend checking the data roaming setting within network settings, and then checking the network status to see if you get 4G. If not, you may need to speak to the support team to get the account settings updated as your roaming may not be active.
Pete.
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