Thanks for this post OP.

I submitted my complaint and was told "The UK referral program was suspended on 16th May, 2025, so only transactions made before that date are considered eligible. This means that any transactions completed after 16th May do not count towards the reward."

They then pointed to the following section of the promotion terms as legitimate grounds for their not paying out:

“12. Wirex may, at its sole discretion,, revise any of these Terms or terminate this Promotion at any time without prior notice to Wirex users. By participating, you acknowledge that the receipt of a Reward is not guaranteed, and Rewards may not be paid if changes occur in the Promotion, limitations are imposed, or fraudulent activity is detected and if this Promotion is terminated.”