"The difficulty grows because of the HDAC change algorithm 2018/10." This is simply not true. HDAC represented onlly +/- 1.5 to 2 TH/s of lyra2v2 traffic at oktober 22 levels. The difficulty increase is because your company willfully misled miners by letting them believe they could make some profit buying your equipment where at the same time you as company were overselling the Z1 equipment, knowing that no-one could make their return on investment with or without HDAC.
HDAC was bigger network than Mona.
But, was there any statement about number of items planned in product's description when you ordered it?
And why to expect a low number here? ASIC supplier is just the winner in this game you wanted to play.
ASIC monkey business as usual...