Inmar rebate for purchase from Villadco Excelsior offered $30 rebate for purchase of 12 bottles of Frontera wine, only sent $12. Del Rio Texas

On 4/25/15 I was incentivized to buy 12 bottles of Frontera wine from my local Keg Liquor on the premise that I would be sent a rebate check of $30.  I carefully filled out the form, including as requested my original receipt, and a additional list of each bottle purchased by UCP code.  The print was very small, but I was careful to fulfill all requirements.  I made copies of each piece of information I sent them, as their requirements were so precise.  I recieved a check dated 5/26/15, but it was only for $12.  They owe me $18.  I see I am not the first to be scammed in this way.