Quality of service going backwards

Recent dealings with Motus Toyota seen the quality of service just going backwards. My wife have a Rav and for the last couple of years took the car in regularly with a parking brake error. Every time Motus just reset the car It became annoying and finally Motus did a deeper investigation and found a part had to be replaced. That is great but they now want us to pay for it after giving them plenty chances to do it well under warranty. It seem like a trap because if you have been back and forth with it. Also considering the car only have 40000km done