Partially updated. See an update in the 1st post above.
I'm glad one of those Telegram accounts was somewhat responsive, and it finally led to partially getting paid. However, did the newly assigned account manager mention why she couldn't handle the remaining outstanding payment as well? Are they facing any issues at the moment?
It looks like the previous account manager who left simply ignored our requests so our account was left without any account manager.
Now she's handling it so it seems better.
That's what it seems, it's still not okay these guys have email accounts that are unresponsive, however let's see if she will handle the next one without any issues, and if she does - then we can say it's all okay.