I recently purchased a used car and transfered the title at a licensing center with the previous owner. I paid for the taxes,tabs, and plates, received a few dollars back in change (I was surprised, expecting to pay more on my card), and asked the clerk if she had in fact received the correct amount of money. She said yes. I was handed a copy of my receipt and title saying clearly that I paid the full amount.
I just recently received a letter from the licensing center which said "the correct amount was not collected from you" and "You will need to return back into our office and pay an additional $100.00." and basically that my title transfer will be delayed until I pay it.
As far as I understand, I have a receipt which is proof that I paid the full amount and the transaction was finalized. I am unsure if this is a scam or not. I want to mail them back a copy of my receipt and say "You gave me this receipt as a proof of purchase. I need proof that I didn't pay the full amount." or something similar.
Basically, what are my rights here? Is this receipt proof of purchase? Are they really allowed to just deny my title transfer even though they gave me a receipt and stamped my receipt or title with an official mark of transfer?
Edit: This is in the state of Minnesota.