ProConnect has been overcharging me on sales tax recently.  My order receipts have the correct amount and they have then been charging me an additional amount after the fact.  I had to call 3 times to even figure out what the charge was.  The guy told me their system is charging me the tax of the city which is 9% but I am not in city limits I pay 8%.  So when I initially pay for the returns I am paying the correct 8% but then they are charging my card for the difference.  The customer service agent said there is no way to correct it and they most likely wont refund me for the incorrect amounts!  How can I fix this?