Momentum Multiply Issues

I called in end of November to cancel my momentum multiply. The app is not compatible with the phone I have and agent assisting did not inform me that the app only works with certain phones when I was in the process of signing up... so for the past few month my safe dayz hasn't been working and it has been a waste of time and money. When I called towards the end of November to cancel the lady I spoke to said the account is canceled. However Momentum Multiply still debited my account in December and thereafter debited my account in January. I need a refund and need this canceled immediately. I tried calling the call center and no service agent is avaliable, no response on Whatsapp also.