Casino770 - Wont pay me

i saw the £20 free bet on the tv , and thought okay ill give it ago and i won £200 pounds but then i turned it into £2440, so i introduced the website to friends and family and they signed up , and now they wont let me withdraw my money due to too many accounts being open, which i feel is unfair as i won that money fair and square. I read the terms and conditions which informed me that i had to deposit £30 to enable me to withdraw the money, which i did. I had a conversation to customer service with casino 770 and they were no help , they lied to me by saying i could not use the account or, accounts as they said, but when i explained to them i was by the computer and that i was going withdraw money whilst i was on the phone, she then retracted her comment and said that they were still open. She then tried to black mail me by saying if i did not accept their 10% "good will" offer that they had offered me, i could not use the website and my account would be suspended. When asking to speak to a manager, or even someone else she outright refused with no explaination. I then asked her if she could send me proof of the accounts that i had apparently opened with the same IP address, which is the issue in why i can not withdraw my winnings, but again she refused and said she could not do this. I continued to ask her questions about the case to which she could not answer and after a lengthy phone conversation she then turned around and said "thank you for your cooperation, im ending this call now" and put the phone down.

The last i spoke to a employee of Casino770, she said i would get a phone call back within the next half hour, which i have not received and it has now been an hour and a half.

Is there any suggestions in what i need to do in order to receive the money that i had won as every time i phone them I end up going round in circles as i get no answers and after reading a lot of complaints on this website with the exact same issue as me, i thought this would be the best option.