888sport Blocked My Verified Account and Refused to Process My Withdrawal

Although my account is completely validated and complies with their criteria, I have been waiting over two months for 888sport to handle my account withdrawal. Their answers to my emails were first quick, but communication stopped at the moment I turned in all the required paperwork to claim my payout. Since then, my account has been disabled; I am unable even to access live chat to fix the problem. They seem to be avoiding me specifically to evade paying the bill. I would highly advise against using 888sport since this has caused great frustration and stress. I would much appreciate your direction if anyone know how to handle this or which authorities to call for help.