I have seen that exact same post here which coincidentally was posted on page 1 on April 22nd. As to someone responding, that happens all the time here as well. The scammers get upset when they can't con everyone they call out of money.
I find the calls amusing. ASMG actually has a Facebook page and Mark Smekhov has liked some of the posts on it. Although his Facebook page says he is located in Moscow which seems rather doubtful.
Amsg called from (678) 619-5974, asking me to log into their website and make a payment, for a payment that was supposedly rejected, however never stating who the rejected payment was to. Also stated their office is currently closed due to the holiday, there is no holiday near this date.