They said me to convert my channel to a group so that they can add members and bla bla.
Isn't that your option? @Boris007 says it has invited enough subs to your channel and he got nothing with it.
He promised to pay 250 USD in BTC and vanished when I gave him a good demo with ample number of members.
Breaking the conversation by blocking the account is not a good solution, as if you are avoiding your dependents to pay at least what is appropriate.
If you want people to believe your offer, please solve your problem first in the
accusation thread.