Beware which Vitality fitness devise you purchase

I am bitterly disappointed in Discovery Vitality and Discovery as a whole. I have 2 life insurance policies with them and I’m a Vitality member. I bought a Tom Tom fitness tracker ( one of Discovery’s listed partners ) so I could log my runs etc with Vitality which has been great. Just recently I noticed that my sessions were not being recorded. I called to find out what the problem was and Discovery have delisted Tom Tom as a partner. I was not given any notice at all. I called into the Discovery contact centre and they simply said that Tom Tom was no longer a partner of theirs and basically said it’s my problem other than to purchase a new devise with the devise booster option. That’s all well and good but I still have to pay up front for a new devise and then I can only get back up to 50% cash back over a period of time. I feel this is extremely unfair especially as they didn’t even bother to notify me. It is not my fault as one of their customers that they took the decision to terminate their partnership with Tom Tom. I am now left with the problem and a devise I cannot use. I just feel this is terrible service from a company that should have their customers best interests at heart.