Who called from 4107888921

call w/no message

I picked up, no one there. Not the first time from "Catonville, MD". So I called the #, it says "the number you dialed is not in serve"

I keep receiving calls from this number, 410-788-8921. When I aswer, there is noone there.  When I try to call back, it says this number is not in service.  How do I stop these calls?

Same as above

Same as above