Momentum multiply app not working yet charging monthly premiums.

I would not recommend Momentum multiply at all. They upgraded their software in Nov last year and since then I have not been able to redeem my weekly or monthly rewards. I train 5 days a week and according to their app I am taking 0 steps per day where as according to my garmin I average 12000- 15000 steps on a day that I am not training. The idea behind paying the monthly subscription is to receive rewards for exercising and staying healthy however I have contacted them 17 times either telephonically, via email or on their what’s app chat and I am told that they are trying to resolve the problem. I find this unacceptable and would like to be refunded my monthly premiums and to cancel multiply or be paid what is due in my rewards.