I have issues also on my bill. I was being charged with calls placed mobile 2 mobile ( Verizon phones being called ) home numbers being charged ( in the number plan ) Not all the time but random, some charged sometimes not. I called Verizon and was credited back for this, my acct. was tagged to make a note of the problems. They gave me 250 min. bonus for the next 6 months. I have 450 min. because most I call are on Verizon, and on My Circle. I looked at my bill and had already used almost half of my min. don't know if it's billable min. or total used. So I'd check it out and give them a call.
Boatman... a 900 min plan is the lowest you can have Friends and Family on. The only free calls you get on 450 is in-network and nights and weekends. If a dumb cs rep credited you, count your blessings and stop complaining.
To the OP, before ASSuming it's a VZW error, wait until you can view your bill. I'd put money on that it's your equipment on there... Either your new Droid, or you got a warranty replacement that you never returned. Looking forward to seeing your bill posted to prove me wrong!