Update 29.06.2021:

By end of May I got an email by miners.eu that they didn't receive the S19 Pro from their supplier, but they can pay the full money back. Therefore I contacted BitMain directly. BitMain told me all miners of Batch April had been sent. But they cannot give any information about their customers to me, what is reasonable.

In this case I wrote a long letter to miners.eu and show my calculation, why I lost a lot of money when I paid in Jan. and cannot get the miners now. I asked them to check where is the problem along supplier chain and hoped they could find out some mistake.  I don't know whether they do something for me or not. Last week, finally I give up and let them send my money back.  I got very soon an answer, 

"BECAUSE OF FINALCIAL SITUATION OF THE COMPANY, NO PAY BACK IS POSSIBLE  UNTILL  01 JAN 2022"!

In the same mail they offered me "10x IBeLink BM-N1" miner as replacement of my 10x S19 Pro! Note that IBeLink BM-N1 has a hashrate of 6.6 Th/s, while S19 Pro 110Th/s!

I felt very ill. I'm looking for a good lawyer.