Several calls from this number looking for a Mrs Johnson? has not learnt that Mrs Johnson will never be at the end of my phone!

Scammer promoting federal government solar rebates. Complete scam.

just missed a call from this number, tried to return the call and an automated message said the number is disconnected...

Selling solar panels. Some curly marketing ploy whereby the first call isn't selling anything, but establishes a business relationship with you the customer, so that subsequent calls are legal, even if you're on the DNCR.