im glad you didnt pay for this. i think its time for you to find another dealer to service your car .

this is common with our infiniti suv and other nissans recently. do you turn off your car with the ac still on? or do you turn off the ac just right before you turn off the car? that may be the cause of it. try turning off the ac and leaving the fan on for a few minutes (or earlier than we normally do) before you turn off the car. also, if your car has a cabin filter, invest in a replacement filter with charcoal if possible. in my case i still smell it initially (if i forget to keep fan on longer) but much less than before.