Pay Day Loans in Texas

I'm in Texas. See below for what I have borrowed and what I have paid back so far. ANY advice is welcome. I've overpaid most of them and would like to send letters asking for a refund and for them to mark my account PIF, I just don't know who is and who isn't legal in Texas. I want to pay back the principle I owe to the others, but nothing more if I don't have to. THANK YOU!!

Little Loan Shoppe - borrowed $300, paid $1680 so far
Integrity Advance - borrowed $600, paid $1538 so far
PayDayOne - borrowed $800, paid $734.25 so far
Nationwide Cash - borrowed $600, paid $1475 so far
Check N Go (this is a storefront in TX, but I got the loan on the Internet) - borrowed $1500, paid $1396.07 so far
PayDayMax - borrowed $900, paid $1112.38 so far
One Step Cash (SSK LLC) - borrowed $400, paid $945 so far
Ace Cash Express (This is a storefront in TX, but I got the loan on the Internet) - borrowed $1000, paid $2515.83 (this one just PIF on Friday, but can I get any of the interest back?)
Sure Advance - borrowed $400, paid $424 so far
Speedy Cash (this is a storefront in TX, but I got the loan on the Internet) - borrowed $500, paid $508.05 so far
Pay Day Loan YES - borrowed $350, paid $420 so far
CashNetUSA - borrowed $900, paid $459.25 so far
Zip19 (ACH says Northway Financial) - borrowed $200, paid $239.96 (this one is PIF as of Friday, didn't know if I could get the interest back)