AdvanceMeToday Taking My Money Internet, Internet

I got a loan through AdvanceMeToday for $500 because I was in deseparate need because of a bill that needed to be paid right then and there. My first payment was for $200, my second payment was also $200, then $180, then $170 , then $150 , then $125 and this pay period a $110 and I started thinking I am paying back more than I borrowed. It was only suppose to be $30 on every hundred you borrowed and I have paid back close to a $1000. I thought this was a good company but I see it is just a ripe off no wonder they were so easy to get a loan from them. How can anyone rip off anyone these days the way economy is? I feel like I should be refunded for my money back anything over that $650 and that should round off to about $500 some odd dollars.  They are still drafting my bank account. What can I do? Help me somebody.