Golden State Transmission and Muffler

My experience here was bad. I went there for diagnosis test because my car seem leaking oil from somewhere. When i went inside, one of the old man was friendly, he guided me to go to front office. The lady there didn’t smile or great me. I told her the problem, gave her the paper (i got oil change at jiffy lube and they told me some parts need fixing, the lady looked and didn’t understand some mechanical terms Jiffy Lube put on the paper and asked me what it means, now that made me worried). Second, they sent in this one guy who checked my car, it took him more than 15mins to connect the «electronic reader» (idk what it’s called) to my car, then after a while of struggling, he cussed and also said ‘man, this thing is complicated (not my car, he was trying to figure out how to use his tools’ while he tried to type my car’s VIN number onto the computer reader thing and that’s when i start to freak out, if a mechanic cussed and complained that it’s complicated to figure out, i don’t want him to check my car anymore. So i told the old man that i don’t want the service anymore, he apologized, and he said to the guy who worked on my car. Apparently they miscommunicate too because that guy did something (idk exactly) wrong and didn’t tell the old man. Anyway, i know it’s not really clear what I’m trying to say but just know i didn’t want to go back there again, even if diagnosis test pretty cheap for $ 45