Is this not more of a bot invasion? Are you a celebrity to gather such large number of followership? Come to talk of it looking at the price fixed one would think this is account holder seems not serious. You claim to be able to provide such number of members to a telegram community, how possible is that? Show proof that you have done that before. If you can drop a WhatsApp number here for chat then you can as well drop your social media handle with which you depend on to get that huge number of people to being a member of telegram community.
I will advise anyone dealing should deal with caution and also seek the service of an escrow so as to prevent issues in the future.