How can we avoid thieves from this website?

Hello Everyone instructors and students

I would like everyone to know that on this website which is supposed to be help people with homework and stuffs, we need to be aware that some thieves are pretended to be professors or doctors and taking people money. I am a victim and I do not want other people to be a victims. First time I came to the homeworkmarket as a friend told me about it and this man Wills Ong'esa email address [email protected] which is his bussiness account with Paypal account charged me $60 for a 750 words and told me i was going to received it on June 27 and I pay since June 23 and yesterday June 30 and he keeps asking for $20 more because the work is overwelming. He insisted that I send him the $20 before I can have the paper send to me during the due June 30 and he told me to send him the money under friends and family so Paypal cannot make him return the money. Well I just finish writting my own paper and never heard from this guy. And his other email address that he used is [email protected] that's the email he told people to send him money. So I will also post the receipt of all the transactions in case if someone think I made it up. See the attachments below