Coin payments should be help responsible for this, if you have done everything right. Open a scam accusation, post up enough proof, otherwise it's just your word against theirs.
Do contact their support before accusing them of anything.
I have seen some thread says that payments are repaid to the people who have lost the money with the coinpayments wallet mate. Still you does not get the payment back from the team.
As pugman said you need to open the thread on scam and acussation section to report they are not else you can pm to Lauda. She can bael to direct the right person on that coinpayments team.