Who called from 2407203487

Four calls in three days from this number. They seem to listen for a minute and then hang up.

No conversation, just silently listens for a minute and waits for our end to hang up.

The phone number for this cleaning company is 240-449-8677 you can reach them directly and speak to a live person. Tell them to stop the calls. Good luck.

Another useless untrustworthy telemarketer that refuses to have their real name show up on the caller ID.  Probably a big scam.

Also got a phone call from Duct Services. Calling from 240-720-3487. Not for sure who they are. Left no message.