I doubt that you will receive any reply from them by posting a message here. It's clear that they are now dodging the issue since they already stopped their long active signature campaign and their official bitcointalk account is inactive since April 13. It's either they will abandoned the forum promotion or they are just preparing necessary document to counter your case. Because paying you is the easiest way to deal the issue yet they let the issue escalated without any official statement from them.

Let's see if they will come back and choose between the easy or hard way on dealing with their issue. One thing is for sure, Your case is valid but we can’t do anything to recover it since coinplay doesn't care about their forum reputation.