"I didn't retire from MMA, " Rampage said ... adding, "But as of now ... I've left the UFC."
He continued ... "The UFC didn't treat me right. I don't like the way I was treated there."
So what pissed him off? Rampage says he was screwed out of cash ... and he feels betrayed over a deal involving Rampage action figures.
Jackson says he's hungry to sign a new deal with a rival MMA company so he can forget the UFC for good -- but he's contractually obligated to wait a month after his last fight until he can sign a new deal.
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