Good news! Went to the dealer today - had to speak to the Sales Manager and General Manager. They agreed to give me the lower MF of 0,00083 when I complained about lack of transparency of the pricing with multiple security deposits because I specifically questioned the original high MF. Will have to sign new leasing agreement tomorrow.
This dealership is known for wanting to receive high customer satisfaction ratings and up to this point I had not been satisfied - now I am.