Poor Service from Momentum Health

I have a premium with your company through my work. When I joined I requested that my children be added to the premium. When I got my second card in February 2020, you have still not added my children onto the card but have deducted the premium. I want to cancel it and want my back for what I paid. The cover is no longer of use for me. My Member Number is: ***. My full names are Joseph Noah