Here are some options:
1. Put up with it.
2. Discontinue your phone service
3. Invest in a call blocking device.
Number 3 will finally give you some peace and quiet. Good luck.
Called me twice two nights. No ID and left no message. One of calls was late at night so I blocked them. Showed up on my missed calls from last night. 6 attempts around 8:59PM... Staying BLOCKED for now. I have no idea who they are..