$40 rebate offer after booking Dollar rent a car

[bigmamimia]

Has anyone ever received an offer for a $40 rebate on your rental after booking with Dollar rent a car? Is there some kind of catch? I don;t want to waste my money calling the number they gave me if this is a scam.

 

[Shelly F - Ohio]

Its for a 3rd party product. Often times if you join then you have a hard time canceling.