Air Conditioner problems of the 2015 Chevrolet Silverado

My name is salvador vargas and I am the owner of the 2015 Chevrolet Silverado lt that I leased on January 31, 2015 from huntington Chevrolet located at 370 oakwood rd, huntington station, NY 11746 (877) 415-8697. I noticed in March when the weather started getting warmer that the air conditioning was not working properly. I brought the vehicle into new rochelle Chevrolet located at 291 main st, new rochelle, NY 10801 (914) 730-9960 to have the a/c serviced, and it was discovered there was no freon. After having the freon put into the a/c system I noticed very strong fumes coming into the cabin. The vehicle was brought back into new rochelle Chevrolet twice to have the problem solved. I have the appropriate paperwork to validate the service. The 2 services at new rochelle did not fix the problem. The smell is unbearable and possibly toxic, and still coming into the cabin as of today.