Also, I called my mortgage company and they said they don't offer anything like that and said it sounded like fraud.

Called the number back and an automated system claimed to be my mortgage company (it named the correct company).  It mentioned a "special offer" asked if anyone over the age of 50 lived in the household.  When I replied "no" the system offered me a $100 rebate coupon for "stores like Walmart" for only $1.95 and asked for my credit card number.  When I didn't reply, it said I didn't qualify and the call was ended.