Bought a used car here and was promised a year of ...

Bought a used car here and was promised a year of free car washes or oil changes. I chose the oil changes and was told that the coupons would come in the mail. After waiting several weeks for the imaginary coupons, I called them, and the managerhole told me to prove that they offered me anything. The proof was supposed to be the coupons that they promised to send me!