Hyundai Tygervalley why???

Bought a vehicle cash. Today, I couldn't start the vehicle!!! Had to get my insurance company to drive through to assist me with jump cables. Just came back from the 15,000km service.????? The brakes scratch when I apply them. Didn't they check to see the mm on the brake pads? Had a snag list when I purchased the car. All the snags are still there!!! Beyond useless!!!!