I am a long term customer of Mayfield Toyota, I do...

I am a long term customer of Mayfield Toyota, I don't have problems with the dealer. But I went to get service from Mayfield Toyota for a regular routine check up for my 2011 4runner. The oil change was free and they charge me $165 for the check up. However, I mentioned to the staff that my front light is not working, so I asked them to check it. After 2 hours, they called me and said the problem is the brake, not the light. Before they go ahead, they asked me to pay $80 to take a look. So I went ahead, then after an hour they told me my car is ready. The service desk told me that everything is fixed and that the fix will last until the next check up in a few months. But after two days, I noticed that the light wasn't working. I called back the service department and asked why after only two days it wasn't work anymore. Now all of a sudden they're saying there's no guarantee it'll work. Now it's worth $500+ to fix it and I asked why they didn't asked me in the first place to fix it at that amount. The staff was rude and told me I was yelling when I wasn't. I'm very frustrated. They hung up on me! I was just asking for an explanation on how to get it fixed and working again long-term not only for two days. Now they're denying that they said it would last until next check-up. I can't be bothered to continue going back and forth paying money to get things fixed over and over again. I contacted the supervisor and left a message, they haven't called me back.