I'm not sure I understand the exact details of your question.
Are you saying that the electronic debit of your account was in the amount that would cover the loan, and ALL fees associated with it? This would include any late fees, fees for the electronic debit, and interest.
I'm sure that the electronic debit of your account was in the agreement you signed when you agreed to their terms so the chance that they did anything wrong in the electronic debit is slim to none.
About the collection calls. There are limits as to what time, and how many calls a collection agency is allowed to make in the attempt to collect a debt. Six calls a day would violate the laws that govern their actions.
Take a look at this link. It outlines what your legal rights are concerning debt collection.
As a foot note, the state of Arkansas has completely outlawed payday loans and I suspect that many will follow.
Fair Debt Collection
I wish you the best.