US Fast Cash scammed, robbed, lied Internet

In June of 2013  we were on a family vacation. An emergency came up and I needed some financial assistance. With no other option at the time, I took out an $800 loan with US Fast Cash. The payments were $240 every two weeks.

We paid the loan via electronic debit of our checking account. Sometime in November, US Fast Cash stopped deducting the payments. By the time they stopped, we had already paid over $2,000 for an $800 loan. None of which actually went towards the $800!. We know this because they have been calling saying that we had stopped paying on the loan. No we didn't, THEY stopped deductions from the checking account. How can any of this be legal? At this point I really don't know what to do because our loan charges keep going up. NEVER do business with US Fast Cash under any circumstances.