Prime Opinion Will Not Pay Me for Offers I Completed Four Months Ago

It has been chaotic trying to get paid by Prime Opinion. They originally assured me everything was good and my account was current. They then claimed that there was a kind of problem with withdrawals and that I would be informed once it was corrected. That was weeks ago. I have not heard since then. I contacted several times, but now they seldom even reply. These fulfilled offers were from four months ago, hence there is no risk of chargebacks or anything; they simply owe me, simple and honest. Right now, they seem to be simply saving the money. Even worse is their early professional and responsive behavior. Silence now is all that exists. Really let down and beginning to feel duped.