I noticed that after getting my oil changed on 6/24/20 that my service StabiliTrak light kept coming on in my car. I called Buick and informed them. I was told to bring it in to get a free diagnostic. I brought it in on 7/9/20 and the same Advisor Ramon Zapata was overseeing the process. I waited in the lobby and less than an hour he came in to tell me that they got the light to cut off. He gave me some diagnostic paperwork which I could not understand. I left the dealership and the light popped right back on. I called and left a message on the service manager's(Alvin Carpio) voicemail. I received a call from Ramon Zapata asking me to bring my car back in so that they could do another diagnostic to find out what was the problem. He asked if I could bring it back on Monday the 13th because he was booked the rest of the week. OK, so finding out what is wrong with my car was not a priority. Due to my work schedule, I told him that I would bring it in on Thursday the 15th. I ended up taking it on the 14th when I got off and left it. Ramon called me on the 16th and told me that the light was on due to an electrical problem with my sun visor that was broken. He said that the wires shorted out internally which was why the light was on. He said that there were two options. One was to replace the visor for about $200 or fix the wires without replacing the visor for $74. I told him that I would call him back. I called Vision which is the company that I have coverage with and they told me to have the dealership call them. I left a message on Ramon's voicemail to call them. He called me back and told me that they approved it and I would just pay the $100 deductible. I approved the work. He called me on the 17th and said that my car was ready. I went to pick my car up on Saturday. The total for the work was $260.39. I paid the deductible and then I left. I got a few miles down the road and the light comes back on again. I was so frustrated by this time. I left a message on Ramon's voicemail and I called Alvin Carpio and voiced my frustrations with him. He said that I could bring my car back on Monday. I told him that I was bringing it right back as I had to work on Monday. This is very time consuming and inconvenient for me. I took it back and they said that they would check everything from front to back to see what the real issue was. They said that it would take some time being that it was electrical. I told them just to find the problem and fix it. I also asked why my car was not test driven before calling me. I was then told that it was and they may have not driven it far enough. If my car was test driven they would've known that they had not found the problem. It is no way that it was test driven because my mileage was still the same from when I dropped it off. They said that the guy that does the electrical would be there on Monday. During the next week I was getting calls from Ramon to give me a status. I received a call on 7/23 and was told that my battery was bad and that would need to be replaced in order for the light to go off. This doesn't make any sense at all. I went to a pick up my car. I got home and there was a lot of corrosion on the battery. They had not even taken the time to clean the battery. I had to go a buy coke to clean it. I went to Oreilly and was told that the battery has nothing to do with the StabiliTrak light coming on. Later I went to get a diagnostic and it came out to be one of my struts. I wasted so much time, energy, and money for something that had nothing to do with the StabiliTrak light being on. My back speakers are no longer coming on so now I have to get them looked at. This is an example of incompetence. I will not be going to that dealership for anything else.