how do I get in contact with billing. I am being charged for family plan & getting charged for members as well. b

You need to go through the Express lane steps:

https://getsupport.apple.com/

Choose iTunes Store, Purchases Billing and Redemption, iTunes Store Account Billing.

You should get the option to setup a call, chat or email.

Beyond that, you can yourself cancel the individual subscriptions to Apple Music for each member on their devices:

Manage your Apple Music membership on your iPhone, iPad, iPod touch, Mac, PC, or Apple TV - Apple Support

Activating a Family Membership does not cancel any individual memberships the Family group members may have, or can subscribe to.

You can use this link to contact iTunes support. https://www.apple.com/emea/support/itunes/contact.html