Hmm... so this is what we get so far
The OP is a fantasist, the incident in question is something he decided to post about after making up the whole story.
If you thoroughly through all of his replies you will see that he has been completely evasive about providing any evidence. Somehow, he cannot state the URL or website name, he cannot provide proof from the blockchain and he will continue to post nonsense here.
Anywhere on their site??
If it is a fine print hidden somewhere, or in their terms and conditions or policy of 50 pages instead of boldly in front of you when you are paying, would that be a "hey! Its your fault. They told you"...?
I remember...a) not seeing it and b) actively looking for it after paying thinking stupid me didn't notice but still not seeing it. And no, I did not comb through their site and terms and conditions to search or any indications that I would be had. I expected a legit business to make sure to make such things clear from the git go. The only reason you wouldn't is to scam people in some shape or form and to some extent.
We need to try to establish what site it is first.
Was it one of the mixers on this list?
https://bitmixlist.comWas it
ChipMixer? (Web Archive link)
It was last year so it is possible you may have visited that site then.
Please do not give this OP alt-account further oxygen, he is clearly attention-seeking while posting nonsense.