If you think like that, I think it's impossible because china just banned bitcoin trading and not prohibits the sale of mining hardware, did you had taken legal steps because you send money through bank transfer, I think you have strong enough evidence to prove that they want trying to commit fraud as you allege but honestly I do not believe they do that.
Nothing is impossible when it comes to the scale of Bitcoin/Cryptocurrency scams/fails. Just look at the Mt.Gox or Bitfinex, they both top exchanges that disappointed everyone.
I am not saying that Bitmain is a scam, and considered their current strong position I wouldn't say so. In their defence, I say that bank transfers of all types can have delayed confirmation times.
Still, it is the best to reach their official help desk first then start a thread here where basically no one has access to their internal system and we can only speculate.