AMERILOAN At first glance AMERILOAN seems to be the typical payday loan offer. But NOOOOO. Internet

At first glance AMERILOAN seems to be the typical payday loan offer.  But NOOOOO.  I engaged with them on a simple $400 payday loan. They sent documents via email that showed a payoff amount of $520.00 with payday "PAYMENTS" of $120 dollars. They even list the next 4 payment dates on the emails that were sent. THEN after making 4 payments for a total of $480 dollars with what I am thinking is a $40 balance I get a reminder for a $170 payment!!!  When I call I find out
that the $480 paid for the last 4 paydays has been a finance charge and from here forward I now owe 8 More payments of $170 dollars which is a $50 principal payment and another $120 finance charge. 
This is a TOTAL of $1840 dollars paid over six months for a simple $400 payday loan!!!!  over $1400 in finance
charges for a staggering 700 percent APR. 
How can they get away with this!!! 
Then more fine print lets you know that they are operating as a Sovereign Indian tribe and thus you cannot file suit against them!!  Please help me stop these con artist.  There information is very deceptive and many folks are suffering in this recession and companies like these are taking what little money we have left.  Please HELP