A question about the rules

[King_Stig]

I was playing a 70$ rebuy at my local card club when this hand came up. Blinds 500\1000. Average stack about 20000. im sitting with about 24000. I pick up AKo and raise to 3500 total from UTG. UTG +1 Push 4300 total (+800) UTG+3 calls. Everybody else folds around to me and i say all in. But I wasnt allowed to do so. Bacause apparently since my raise wasnt doubled when he pushed all in it didnt count as a raise hence i could not reraise. Result: I got drawn out by UTG+3 with J8s. What are the official rules (WPT) about this??