INFINITI of Englewood

I leased a new Q50 and traded in my old infiniti. it has now been three months that NMAC threatening to report me to a collection agency because "Infiniti of Englewood" didn't pay my remained balance fully. I visited more than 7 times and each time I am assured that it will be resolved ASAP. But, it is still not paid yet, and it will impacting my credit score soon. The way that "Infiniti of Englewood" has handled this matter has been unacceptable and I cannot recommend this location to anyone. I love Infiniti cars, but I don't think I get anther Infiniti again, because of "Infiniti of Englewood"