Do not fall for this!
If I were you, I will be reporting this user to mark its account as SCAM and to minimize the risk of people getting scammed.

You can use Telegram Support and chatting with @notoscam. Just provide a concise explanation about the issue.

You can use https://localbitcoins.com/ if you want to buy some crypto instead of dealing with people in telegram which are more likely to be scammers.