We have switched off the exchanger UnioChange from our monitor BestChange.com for the time of investigation.
That's a good action from your side. since UnioChange does their business but their management handles customers unprofessionally. Removing them from Bestchange.com is not going to help OP since the accusation running and you cannot avoid your liability just by removing UnioChange from BestChange.com. We expect you should talk with both Customer and UnioChange and solve this if possible.
@OP, We heard from both sides. I believe UnioChange doing their business unprofessionally but also you did some mistakes. Look like you provided all the info to a scammer and he took advantage of it. You shouldn't contact them via Telegram search. Use Telegram "handle" what they mentioned on their official website. Or you should be on email as you started with the email.
This case becomes a bit lose/lose situation. If they pay you they will lose that full amount. but if they do not. you will lose that full amount.
It would be good if The UnioChange Paid at least 50% of it since they also managed it unprofessionally and they have mistakes. Also, OP should sacrifice your 50% because you did some mistakes.
That's just my personal opinion, not any Suggestion.
We expecting a solution from BestChange.
Thank you very much for your opinion, but we are interested in identifying the errors that we made and that caused the loss of this money, and we will certainly accept them and fix them.. We also hope that the errors will be evaluated for both the client and our website so that we can set the percentage of loss for each party based on the percentage of error .. We are certainly cooperating