General Motors review: service department

I bought a new 2019 malibu in Dec. 2018. Sales person mentioned 200.00 for a remote start since I mentioned I would not keep On Star. When I cancelled On Star I ordered 2 new Fobs for remote star after answering yes my car was capable of remote star. (My mistake). My remote was available thru On Star but a monthly fee. I got 2 new fobs a lot less money than thru Miles, programmed fobs at home and remote start wouldn't work. After calling service, was told oh we have to set your computer thru our computer, it will be 79.99. I dropped off car, got call at work, where is authorization Number? I didn't know what they were talking about. After talking to them now quoted 300.00, tried another GM dealer and found out my new fobs were non refundable. (My Mistake). Then called back and asked Miles how much to fix it and was then quoted 341.00. Called back to the other GM dealer, they had a lot of Empathy and offered to do the new install kit with NO Labor. I didn't even buy my car from them. Miles never once tried to help me, had a horrible attitude. I paid 20000.00 for a new car which now has only 646 miles on it. I feel I was being pushed into the On Star program, since the car was so new, no one really answered my questions about this problem with any knowledge, no one said oh let me try to help you. I am worried I have to deal with this dept. during my extended warranty and asked if I can transfer it, the response was, You can take your car any where you want but you may end paying a deductible. What a nice response.