Delays payment and refuses to pay almost half of it

Hi, I have acceptes the no deposit bonus from them, made all the wagering requirments and withdrew £150 (the maximum possible amount using the bonus). I have sent all my documents for verification, they were verified (or at least this is what I was told). Also, in order to withdraw for the first time, I had to make a deposit of at least £25, which I did. Therefore, at this point I had £150 as a pending withdrawal and £25 in my account. The minimum withdraw amount is £100, therefore, in 22 minutes I went from £25 to £100 and made another withdraw. This happened on 4th Feb, 11 days ago. I was told by agents on livechat both my withdrawals will be processed by 12th Feb (3 days ago). Today, the withdrawals still pending, I started a livechat to see what is going on and I am told I will only be paid £150, not £250, because they concluded all this money were won using the no deposit bonus, which is not true and can easily be verified checking my deposit and playing history. As a customer, I am highly dissapointed and I fee they don't want to pay at all. I want the full £250 since I earned it.