As far as I know, Cryptopia was attacked by hackers, so it seems to me that you will not be able to get your funds back. Unfortunately, keeping coins on your account increases the risk of losing money, so maybe you should consider using exchangers, Changelly, CoinSwitch or ChangeNOW, which I use the last time. You should not register here, therefore, you do not lose money if they have problems.
Can't I get back anyway? It was the problem of their exchange website. So why we will lose our coins!!
That's hard things to do, and no one can bringing back your assets/coins expect hacker itself. It's not exchange problem, all exchange in cryptocurrency can be hacked even though they have a high security system IMO. Hackers will always look for many ways so as they can knock down an exchange they are headed for.
So why we will lose our coins!!That's a genuinely risk you have to face when having an investment in cryptocurrency. I hope, before you decide to invest in this place then you should at least know every risk that will/will definitely be faced. A bit advice for you, if decide to investing again in cryptocurrency then you have to try for save your in hardware wallet, the possibility to be stolen by hackers is 0.1%.