Inmar Rebates Didn't fulfill my rebate! Internet

 Back in June of last year, I bought some Roundup BECAUSE of the rebate, the other brand was less expensive, but with the rebate the Roundup was less.  I mailed in my rebate on 7/5/13.  My father passed away on 7/8/13 and my world went into a tail spin.  I forgot all about my rebate.  When cleaning up some stuff I found my photocopy of my rebate and realized that I never got it. 

When I wrote in Inmar they didn't ask for proof of my rebate, or anything they just said that it was too old to process.  Well the age shouldn't matter, I followed the rules and submitted my rebate in a timely manor, why aren't they responsible to hold up their end and send me my money???????  It's only $10, but that will buy a nice lunch.  I will not buy anything else that has a rebate from Inmar if this is how they treat people!  What a joke!