I almost believed it, but decided to ask his profile on the forum before giving him the coupon ... He replied that he was not registered on the forum, but I found his profile by telegram login. I said that he submitted via the 'Ropsten Test Network'.
Your awareness and knowledge about bitcointalk account saved you this time and people’s like him will not be able to do something similar in the future if you follow the same way. Only a few amount of people feel it necessary to get detail informations about the service provider which always keep bad results foe them.
Anyway, personally i will suggest you to avoid dealing in Telegram and using escrows is a priority when you are taking service from a newbie.
Then he simply deleted the entire dialogue, I did not have time to take all the screenshots,
Its nothing new. By using Telegram scammers are taking this advantage and easily erase everything after every deal.