From what I could find on the web, HashNest was founded in 2013 by Bitmain, and they were probably one of the few legit cloud mining platforms. Otherwise, I doubt they would have survived so long in the market. It is unfortunate that their government has decided to ban mining in China, but I do not think it is HashNest's fault.
According to their announcements, termination of agreements and redemptions have been open since August last year.
https://support.hashnest.com/hc/en-us/articles/4404299214105-Announcement-183-Termination-of-Agreements-and-Redemption-Open-OP, why have you waited so long? You should have sold your shares by now.
They did, but not all kinds of hash rates, there are only a few with a small number of shares every day, then they stopped. My S19 hash rate was never on the buying list. Their last announcement was 6 September anyway
