Hi everyone, same thing happened to me.
Last year on 29.12.2020 I ordered an Antminer T19 from Miners EU for 2.900€ and payed directly after receiving my order confirmation. Then, nothing at all happened. I did not get a confirmation of my payment and I did not get any replies to my message that I sent a few days later. On 10.01.2021 I got this message: "Unfortunately our supplier has increased prices considerably, can we offer you an alternative miner + partial refund ?" I replied which alternative miner they would offer me and to which price. Again, I got no answer, even after sending another mail. On 19.01.2021, without any further comments, I got a mail that my original payment had been refunded.
I am sure that they saw the opportunity of selling the Antminer T19 for a higher price than they sold it to me for (right now on their website it is being sold for 6.000€), so they did not honour the contract with me to make more profit.