Won't the accounts you've communicated with before save the history of their correspondence with you? I mean, you should be able to see it. If the history is deleted, then the deletion is already an alarming sign. Why would a person delete the history? Dad, Mom, the way you write and scare people, they won't delete the history.
A newbie or someone not always mentally prepared for such things will barely notice such details so quickly, and by the time they realize, the scammer has done his job and gone. It's a red flag and an indication, yes, but only if you are fast and smart enough to notice it immediately, but some of the scammers are pretty good at what they do, and they won't let you notice things quickly unless you have already been through such things or have enough knowledge to notice something is fishy immediately as you start chatting with them.
Fraudsters who bought a premium account will be able to write to you. This is, of course, possible, but it will be quite expensive for them, and they can be identified since they pay for their premium with a card, the details of which can be found out.
Fragment is a website that allows you to buy a bunch of stuff for Telegram, including Premium, and even numbers
using TON. All you need for that is a decentralized Ton wallet, such as TonKeeper, that you will connect with the website and make your payment with it, and they will only ask for your username and that's it, either you are buying Premium, Stars, or anything, you are not required to do KYC or anything like that. So, scammers will definitely not use their real identity to make purchases on accounts that they use for such purposes.