Roy Waight thought he had a deal. After all, he was already driving the 1999 Toyota truck he was leasing from a Miami-Dade dealership and was paying $389 a month for the privilege.

But Waight alleges that the dealership, Potamkin Toyota in North Miami-Dade, reneged on the lease deal and asked him to increase his monthly payments to $450. When Waight refused, he says the dealership forged his signature on a contract allowing it to change the lease terms.