TapJoy review: refused to honor offer

Tapjoy lists an offer to reward xx, xxx amount of diamonds if you purchase $30 worth of products from the vendor. I provided screenshots of the offer, my invoice from the vendor. Tapjoy claims I completed an offer that I shouldn't have had offered and told me to return the merchandise from the vendor and get a refund.

The vendor isn't responsible for tapjoys promised rewards. I would not have made the purchase if there wasn't a promised award of diamonds.

Tapjoys response, "we apologize but we will not issue the reward".