Vitality Weigh loss rewards

I am honestly at my wits' end with Vitality Weigh loss Rewards.

I have been trying to activate this benefit for nearly 2 weeks now.

It continuously keeps asking me to specify my cash back account yet, yet there is now way too!!!

Firstly, you system is seemingly unable to manage a change in main membership. When we changed in July this year. My husband was the main member and we changed it so that I become the main member. As part of this change, we changed the cash back account which should be used to my account. It was on the notification of change!!!

Yet now when I try to activate my vitality weight loss benefit it keeps prompting me to change/choose a cash back account. When I do, it says my husband had his wallet activated. When we try to change it on his account it prompts us that only the main member can change it and that the main member should log in. When I log it it takes me to my wallet!!! So we are absolutely unable to to change this!!

I've emailed and called twice. This is my 5th attempt to get this sorted out.