I guess you must have had those accounts on track with your telegram so to stop receiving updates from them then you'd need to take them all out of your track list. Perhaps whether both or whatever it maybe, stay out of them because it's all maliciously booming to be scamming hunters.
I don't think that OP is tracking those accounts with his Telegram notifier bot because most of those accounts are newly created and there's no reason to track such accounts. When someone tracks a board in that Telegram notifier bot then such kind of scammer's posts also get tracked and that's the case with the OP I guess.
My advice for OP is to just ignore such spam posts and keep tracking the boards in his Telegram notifier bot if those boards excite him/her or are accounting to OP's interests. There is no need to stop tracking those boards only because of the scammers who're spamming such type of posts. We should never get frustrated by such spam posts and in frustration if someone un-tracks a board that means we give up and they win.