Is there a way to turn off calling but leave on messaging please?

Is there a way to turn off my kids calling contacts but still be able to call the echo devices within my home please?

I've had to turn off their devices from communicating as they were calling anyone & everyone all the time & really bugging everyone in my contacts but it won't allow me to leave household drop-in on so we can communicate within our home.

They also can't message anyone at all. The settings should allow you to choose which device can do what & which contact, unfortunately, it's all or nothing unless you know something I don't please?

If anyone has an answer or solution, I'd be grateful.

Thank you.