No exchanges have supported Wisp as far as I know. I notified Cryptopia and Livecoin about the fork back in the days, but the only thing that resulted from it was that I got banned from the Spectrecoin Discord. xD You can ask Cryptopia to give you your Wisp coins from the original Spectrecoin chain, but I doubt that they will act on it. Generally it is advisable to store your coins in your own wallet, which is in sync with the decentralization philosophy that backs Wisp. So if you store your coins on an exchange and they move to a different chain, that is basically your own fault.

If you have stored your coins in your local wallet, accessing your WISP is as simple as importing your wallet.dat from the Spectrecoin wallet.