No, they don't. They do have their rules to follow (mostly to prevent fraud).
The OP did not sign his rebate form (I saw the form before he took the link down). I don't understand why he refuses to believe it when it was plainly there. But they are still giving him a second chance to send in corrected rebate and still get it.
Follow the rules, get the rebate, don't follow them, and you don't get the rebate.
Then when people like the OP botch their MIR the company doesn't have to honor it and that $20 more dollars they don't have to pay out.
I'm not saying they are always looking for a way out of the MIR but they are on a very low priority with most companies and they are probably told to find anything wrong with the claim so they can be rejected. 6-8 weeks to me says, it's alot of work and you'll get it when we get to it.