I have gotten 4 calls in 3 days so far also.
Never leaves a message.
I believe it is spoofed.
Have you answered and found out what they are hocking?
I think they also spoof number 240-210-7143 as that number called me immediately after I disconnected my phone from an incoming 207 call.

mine shows thermal cast llc when calling form this number.  I answered yesterday when it called and there was a long pause, then a foreign accent spoke, then I  hung up.  They've called 3 times today.  I'm a business and don't do business at all with this company.

Sandy

They called me back AGAIN today I see.
I am a business (who has not done business with them either) also so if it was that important, they could leave a message on my machine that is on all the time.