He seems to be a disgruntled troll too who was trying to look for your attention... Why would he have to even look up your telegram handle for starters.

I think the clue about this person is;
1. Recently translated one of your posts but did not get merited, and now he feels pissed off he was not noticed
2. Most likely a low ranking account trying to farm for merits
3. English language is certainly not his first language. From the phone number, it shows registered from Bangladesh. I would start by looking at the recent translators from that Board.

More clues
"Thier"
"Postes"