I didn't even know until today, that they've cancelled the giveaway. I've only seen the rebranding of their site.
Extremely shady move. 

I don't know if it was similar for your account that so many tasks were pending, that was very strange and just looking like they've planned this scam from the beginning. I have no proof for this but it's really looking like a planned scam strategy.

If they don't pay, the reputation of KuCoin exchange will be damaged for sure.