Op next time don't buy a token that there is no sell option because you might buy a token and there is no place to sell it and the token would remain with you forever and you lost your funds. You have to be wise and calculative in this investment business. Telegram is a scammers social media platform and I don't think you can get back your funds again.
And the only solution you might have is to contact telegram support team if there.is any to contact. And the dexscreener you are saying that they are lot of sellers testimonies, most of those testimonies are the same scammers group to make people believe that they legit and probably the dexscreener is recommended by them in the telegram group.
At first I think it's crazy or weird but then I realized that there are people buying tokens in an ICO for example in which the tokens are not also listed yet but has a plan soon for it, and the only reason on why they do it, is because they can get the tokens at a better value.
I think Telegram is not a social media but no doubt that many scammers are lurking there, so we must be careful dealing with someone on this app. I don't think Telegram team can help with this issue because the case is not directly related to them but maybe there are crypto experts who still can do something with it. I lately seeing this dexscreener in the forum, so I'm thinking that it was the latest shill here? HHmm...