here is your payday law for NH, just for reference (it sounds like you've investigated it already):
http://www.debtconsolidationcare.com/paydayloan/explain-pdls-laws.html
Ok, let's tackle your loans!
-NH has a pretty consumer-unfriendly payday law. It allows for unlimited finance charge/interest rates, offers no cooling-off period between loans, and doesn't provide for repayment plans. That's a pretty bad deal for consumers!
-There may be a glimmer of hope here, though - NH law states "no rollovers" - unless you have renewed the loan for MORE money and paid off the proceeds of the previous loan with it. Did this happen with any of your loans? If they are not licensed, and didn't follow the law, then you have already paid in full, and in fact, overpaid on any that you have repaid the principal on.
-You will need to find out if these companies are licensed to do business in your state. That is going to be the one thing that is in your corner when you fight them. If they are not licensed to lend into your state, and you have already repaid the principal, I would request to be marked paid in full. Given the dollar amounts you've stated you've paid on some of them, you have far overpaid them, even if you consider that the state would allow 6% interest if the loan went into default - you've already surpassed that amount on some of them.
-Are these all internet loans or are some of them storefront? From the sound of your post, I assumed they were internet lenders, because you said you couldn't contact them.
-As far as worrying about what they can do about you closing your account - don't worry. NH prohibits criminal action on defaulted payday loans. All they can do is call and bug you, which some of them will. Stay strong, and if you have already overpaid them, just keep repeating that to them over and over...they will eventually give up.
-Send letters to the ones you have overpaid and request to be marked paid in full, and request a refund of the overpayment. Include a statement that revokes their ACH authorization (even though you've closed your account - it's good to have that revocation in writing) and revoking any voluntary wage assignment clause they have in their contract. Give a copy of the letters to your employer's payroll department - if the lenders try to hit you with wage assignment, it will be important that your payroll dept. has the revocation in hand. Send the letters via Certified Mail/Return Receipt Requested so you have proof that they received them. File complaints on the unlicensed lenderes with the New Hampshire Banking Department as listed in the law above.
Hope this helps! Let us know if you need additional help!