Hi i have pivx coins in Yobit exchange they are stuck because the wallet it is on maitenance, they said that it is like that because PIVX hasn't update the wallet, so im writing, will some one from pivx support can fixed this problem please thank you.
Not a PIVX problem. Yobit is notorious for failing to update wallets (not just for PIVX). All PIVX or any other coin can do is remind them. Your coins are stuck there until Yobit gets off its ass, which may or may not ever happen. Sorry.
More generally, use Yobit only if you absolutely have to. Cryptopia caters to a similar demographic (i.e., they list pretty much any coin that wants to be listed) but is far less shit. But for something pretty established and 'mainstream' like PIVX, better to use a reputable exchange regardless. Bittrex is usually a safe choice.
But it looks like you have a bigger problem! Mac Wallet no longer run, error in it, Coins disappear, with me 120 Coins away, transaction hysteresis is not true.