It's SiriusXM Radio in their constant and annoying marketing barrage to get you to sign up after your free trial ends. I've had to block numerous phone numbers from them because they don't stop calling.
Called me at 1:27 p.m. today, and they've called many times earlier. I bought a new car in April with a 90-day XM Radio free trial, which I did not pursue into a subscription. (It's actually nicer to just listen to the quiet car and not have to put up with a lot of chatter.) I didn't answer.