I made the mistake of using a bluetooth hands-free device. I would get home, forget to manually disconnect, and then miss calls. Now our laws are so draconian I’ve developed the habit to just leave the phone in my pocket - zero calls on the road.
My question to your question is - do you know if the bluetooth is actually shuttling the audio from your calls to the remote device? Can you get someone to sit in the vehicle and verify that it isn’t intercepting the calls whan you think you’re disconnected?
I’ve never had a cell phone problem....
I’ve never owned a cell phone...:^)