This number has been calling me since April 4th. They never leave a voicemail. I thought it was an old boss and was going to pick up the next time but I found out it's a spoofed number.

This is a confusing one.  I called the number and it is Sirius XM radio.  Listened to the options and it's about extending your trial version.  However, I can see where this might be confusing because they don't identify themselves on caller ID.  Anyway, it does appear to be Sirius XM.  Hope this helps.