Worst Service and they do not take responsibility for products sold on there online shop! Watch out!

I bought a Garmin Vivovit3 from there shop in October. It never wanted to sync with my phone even after trying online troubleshooting and other phones. This all was reported to Momentum but after 11 phone calls and numerous emails I never got any replies. Only when I started getting persistent did people start coming back to me but always blaming Garmin and telling me to try deleting it and so on. My issue is that this is not my problem, when I buy something from a retail store and it does not work, I take it back to the store, not the brand company. And initially I was willing to try and help them to help me but after all the phone calls and never a reply from the, I got fed up and just want my money back. They make alot of promises that they do not keep and they try to "pass the buck'! WORST SERVICE EVER!