Cryptopia exchange tend to ask for additional fees to upgrade their wallets when coins have mandatory upgrades. It's their basic approach to earn as much fees from projects as possible. For MTNC after the swap, I don't think that the coin should stick with Cryptopia, that has not actually get their trust back after their hacks months ago.
We still have Nova Exchange, The only thing needed is dev communication, They already provided a dead line before they delist MTCN, Lets just hope Ideaupdater are in close contact with novaexchange owners.