LOL The pharmacist is one of the member who are always in front of my eyes. I don't reply always but looking at his understanding about tech savvy I do not think he will take the time to create a telegram channel then will text you there. It was defiantly someone else and you are mixing him with The pharmacist.
Now about the negative trust, if you talk to him with respect then I am sure he will understand your points. But the way you are approaching it's not gonna help.
I do not have to be respectful to anyone, if you say that the one in the chat is not him, how would you explain that the link is the same? Black magic?
How about (may be) you and your mate scripted the whole thing to prove him guilty after receiving the red trust? What prove do you have that the telegram account is his?