It's North American Bancard soliciting merchant services. The message stated: No contract, free equipment, guaranteed lowest rates or they will pay you $500.

Trust me this is not true. NAB puts you on a tiered program which has relatively high rates and they do have contractual requirements with an early termination fee of $250. The equipment is not free, usually they lease it to you at a high cost.

Look at their BBB rating, it sucks.