William Hill — player complaint #65061, 2019-05-10: withheld payouts

Hello Team, I need your help. Here is my story : I decided to give it a try with Willhill sports betting. I opened an account with them and verified my account with my national ID and Utility Bill.They confirmed it verified !I firstly used paysafe voucher to deposit , but not luck. Then I deposit again few times( 200 and 300GBP ) via my Ecopayz Gold level verified wallet account to Willhill again and after spending around 500GBP I won big amount 10k I requested a withdrawal for small amount and continue playing when suddenly willhill docs department locked my account and asked for additional verification documents. First I though this is something regular as the amount I won is big. First they asked me to provide my ID and selfie with my ID as well as Utility Bill and selfie with Utility Bill. I did so. Instead of unlocking my account then they asked me to provide my passport and selfie with my passport- I did so. Then they asked me to provide selfie with my willhill ID account number and username- I did so. Then they asked for screenshot of my ecopayz account showing my deposit to willhill- I did so. They they asked me to provide screenshot how did I deposit to ecopayz- I did so. Then they asked me for source of funds , Bank statement etc- I did that again. Even it is obvious they did pure customer abuse as they don`t want to pay my winning I patiently provided every single document, selfie or screenshot they asked for. Now from 2 weeks after their last request there is no answer from their side and when I asked a week ago what is going on they answered they are still reviewing my account. They cannot do such thing with customer who fairly won and provided everything they asked for?!? I also consider file an official complain with FCI and I hope that if needed you can assist with that as well Please help me... [EDIT]