Fund Help

I decided to ask help on this websites, cause I don't know what to do just to return the money of my sister. I'm one of the silent investor who have a dreams and take a risk just to fulfill my financial need of my family and to my self. At first investment that I encounter is sounds good every thing is under control. How ever after 5 months I decided to invest all my money and my money sister because they have a Good offer for us. Suddenly after investing all my money including my money sister until now the person that I talk to no responsed even the capital I'm not yet recieved. I'm worried that my money may lost for no reason. And as of now I have a lot of payment due that I need to pay and my salary is not enought to pay all my deot specially return my sister's money that she hundle under her name with her Officemate. Hoping that you help me for my situation. I really appreciate your help. And I will say on the button of heart. Thank you so much.