AFS system, Air Flap System?

Got error message about AFS in December of last year. Now my transmission has started to fail they say due to me not getting the AFS system replaced. I started having transmission problems about 6 or more months ago. Scheduled countless appointments regarding the symptoms I was having with it. Each and every time they would say no it's not your transmission. It's the AFS system. My started shifting funny, kind of jerky. Small but I noticed it right away. Called again to Schedule appointments for it to be seen. Again, they tell me it's the AFS system. I asked them to please just check the transmission because I know you're saying AFS because that's the code you see. I'm asking for transmission to be looked at because that's what I'm feeling. It was ignored again because I declined a repair on the AFS system because I could afford it. I asked could I just get someone to check my transmission. It's sealed and I want to make sure it has what it needs to run efficiently. No one checked it for months and months. They would just go off of the codes it read. Help me please, I want to sue my dealership for negligence. I know I had an AFS code error message. Okay, but how come when I ask specifically about service on my transmission, they said no because I wouldn't and couldn't afford the $1,000.00 plus, repair for the AFS system. Please help me my transmission is failing now I feel due to them not caring about what I ask them to do versus what they wanted me to do about the AFS. I have a right to choose what service I get done on my car, yes?