Got to really check out a car before you buy it!! ...

Got to really check out a car before you buy it!! I want to say I had a great exoerience buying a car at Harrold Ford, but so far I can not. I saw the car I wanted on line, I phoned Harrold Ford to make sure it was still available, I was assured it was available, and would be ready for me to pick up the next day. I took an Uber, and a ride half way since I live in San Jose .... when I got there they told me the car was being looked over because the engine light was on, what!? I was expecting to drive home in my new car. Well after waiting for some time I was told they needed a part and it would take an hour, so I waited (didnt have a whole lot of options) got the car to drive home, brakes were squeaking real bad! And something smelled like it was burning ... I figured whatever they fixed was drying or something. About 6 weeks later the smell is getting worse, and the oil light is going on, I take it in for an oil change, the guy tells me I have an oil leak. I drive it back to Harrold Ford since its under the 90 day, or 3,000 mile warranty. I have to leave it there?! How do I get home ... I have to rent a car?! But for how long .... I am calling, they say they will call me back, no call back. I call the person who sold me the car ... no answer. Now how long do I have to pay for a rental? I have no answers