I don't know, but there are some cases where your number will be hidden without a username set on your profile. Some people can still see your mobile number. I don't know if it's just a feature for a specific person, maybe the premium users or something.
You cannot see someone's phone number unless they add you to their contact list and share their phone number with you. No matter if you use Premium. The number will remain hidden if they do not share their contact with you.
Even if I could match a user from Bangladesh who posted on my merit thread and possibly on the translation one, maybe involved in some scam project in the past, I couldn't point him out with enough degree of certainty to be able to send a red trust.
When I saw the screenshot, I immediately thought it was one of my country's mates. I guess I have seen some translation in our local thread and I guess they were expecting merits from you. I strongly believe
this is the user who sent you private messages on telegram. The translation seems auto-generated. Also, I believe this user owns
this account.