Hertz The Hertz Corporation Unauthorized Charge to my Account Memphis Tennessee

We had to rent a vehicle for over a month due to a drunk driver plowing into out truck in the middle of the night.  Our insurance company uses Hertz.  Like I said, over a month later, our truck was fixed.  The body shop requested an extension for three more days through our insurance company and it was approved.  As was the extension on our rental car.  Of course they were to be paid with two separate checks.  Hertz received the first check, but did NOT wait for the second check from the insurance company and automatically charged my debit card for the difference.  No phone call, no email...just BAM, took the money. We were assured when we first rented the vehicle and had to give them a card, we would NEVER be charged for anything.  This caused a chain reaction of NSF charged to my account, as I was unaware for a few days that they have even taken MY money.  My insurance company stopped Hertz check and is sending me one for the amount of the actual bill, but, and I understand, that Hertz IS responsible to reimbursing the NSF fees due to the fact that they are the ones responsible for causing them.  I have spent too much time on the phone, sending emails, scanning bank statements and on chat with this company.  I have done EVERYTHING that they have requested me to do to be refunded.  But every time I contact them, they tell me to send an email to customerrelations@hertz.com.  Like I have not done that 20 times already.  I will NEVER use Hertz again and will gladly give my opinion of them if any one asks.  I just want to be refunded what is mine and Hertz caused me to lose.