Firestone Complete Auto Care review: Repair(s)

Took my car into the Speedway, IN site. They replaced my starter. $550.00.

Drove it home. Parked. One hour later went to Walmart/ Got back to the car and? Car wouldn't start. Same as before. After 20 minutes it finally started. I had called the store from the WM parking lot. While they offered a tow I was asked if I had okayed some sort of scan. NO. I was NEVER asked. The person I spoke with indicated it was all my fault. I drove my car back to the shop where for another $100 plus they "fixed" the car. I don't get more than 100 feet from the store when the "check engine" came on. Called the store and was told it wasn't their problem. None of the repairs "done" dealt with -the engine. Trips to two places came up with the same problem code, P0706 TRANSMISSION Ranger Sensor, A. Had they bothered to check the car to see if it would start multiple times, the non-starting issue was intermented. They were told this.They evidently only drove the car from the bay to the parking lot. Had they bothered to drive the car after the second "repair" they should have seen the "check engine" light. NOW? I am out $650 and have a car I'm afraid to drive. i also can not trust the garage to do anything to fix this,