Hello.
Im a web scraping expert,and i've worked on many projects similar to this one.
I can deliver you a bot with all the features you needed in a short time.
I telegram is secure website and almost we can't scrape it without Using their API.
To be didn't use Telegram API for any project before, but i'm quite experienced with these kind of technologie and i can understand how the API is working.
I look forward to hear from you.
Best regards.