Complaint Review: Future Income Payments

I have MS and was on disabilty retirement and social security I have been looking at loans for dental work since 2015. One day i recieved a email for a approval loan for $1800. I emailed back and it was the worst mistake. The company been asking for information on my finances and if i could be approved. I avoided them for weeks and i needed dental work. They sent me forms to look over and sign. After i looked at the papers i did not sign all of the paper fter i got to the terms. $1800 at $300 a month terms of 300. I told them i did not agree and question those terms. All they said to me i could pay it off anytime. I was shocked , before i recieved the money i could pay them bavk $2600. I told them to forget it and not to deposit the money. I went to my bank and they went againsted my wishes and deposited the money making me responable for $2600. I never signed and wonder how they had my signature. I got from micosoft my computer has been breached since 2015 by 2 IP in France and nigeria. So they have in my computer for almost 2 years.