Ac and heating repair service near Hallandale, FL

First they forgot the two appointments I had made. One on a Sunday they forgot, then the Monday lunchtime for an oil change. After two apologies they did the oil change and filter on Tuesday. They kept stressing how I required, "a full car checkup for only $25". I declined. I drove home and checked the oil. A good portion of it was over the engine, as they had not screwed the oil filler cap down enough. 2 days later I went back and told them and also mentioned that the transmission was shifting erratically and they stressed how important a full car checkup would be at this point and how they could do a full service on the transmission, although I had had NO problems till this point. I went elsewhere and the vacuum hose leading to the shifter actuator on the side of the transmission had been removed and neatly coiled up on the side of the engine. I thought about going in swinging to the mental midget who runs the place, but realised it would not do anything. These jokers should not be allowed to be in business. Please avoid them at all costs.

I want second opinion, and repair or used replacement