Beware of **** subscriptions

I had meals for two at Mug & Bean Gateway and registered this on First Loyalty App but did not get any discount on these meals as promised. Furthermore, I tried booking accommodation for two via the app but failed to secure a discount as promised. But when I booked without the app, I got a lower price. Convinced that this is a ****, I attempted twice to cancel this subscription via the app email but got no response or confirmation to date.