欺诈活动

我在Deriv交易帐户有761 $，现在在证明我用朋友卡付款后，他们决定向我寄回这张收据，因为他们承受了很大的压力，说他们只能退还我$ 100。请问如何起诉这家公司。他们是欺诈的公司。看到我使用了我的朋友帐户后没有拒绝我的付款，但是我取款的时候，立即问我有关我使用他们提供了证据的卡的人。现在只退还100美元

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FRAUDULENT ACTIVITIES OF BINARY DERIV

I have 761$ in my deriv trading account and now after bringing proves that I made payments with my friends card, they decided to send me this receipt after much pressure on them stating that the are refunding me only $100.please how can I sue this company.they are fraudulent.the didn't reject my payment when the saw I used my friends account, immediately I wanted to withdraw the now asked me about the people I used their cards which I provided evidences.now the are refunding only $100