For sure, the more reports we send, the faster it will be handled. This usually takes between 5 and 15 days to be processed by Telegram.
I believe they can move even faster if many reports are received. If I remember well, the first 3 shady groups were deleted fast when forum users made an effort to send many reports to Telegram for those groups. They were all closed, although some of them were really big.
There's also this method;
Once you are logged into your account, go to the chat section and search for ‘@notoscam’ bot. The name of the bot is Antiscam and it has a verified tick on it as well.
https://t.me/notoscam
This should work too. The important part is to have those groups reported. Eventually, the reports could contain also links to UniJoin's website,
Contact section, as there is visible the official Telegram name of UniJoin, thus ensuring Telegram that the other group is fake. (At least, this is what I did when I made the report.)