Best answer by Marc
Welcome to the community!
Thanks for posting.
Check out this FAQ on how rewards work - it explains how you'll get your vouchers a few days after coming on supply.
We're not able to change your rewards. It's not personal - at whatever day/time we announced this summer promotion there was always going to be a few people who'd just switched on the standard £25 reward.
But, now that you're switching, you can of course refer as many friends and family members as you can find, and get £50 for each of those! :)