The First Group review: after sales customer service

I have invested around $750000 with The First Group. After long delays and it becoming clear that is company is very dishonest and is cheating many people, I decided to opt out of the investment. I went to Dubai and told them in person and they said they would work out how much I would get back and then contact me. I have tried emailing, phoning, text message, I tried to contact them through twitter. They have decided to deal with this issue by simply ignoring me.