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Hello. If your spark plug blew out, it would have been very loud. Was it very loud when this supposedly happened?
What did they do to repair the plug that had blown out? Did they simply screw the plug back in? were the threads damaged forcing them to install a heli coil?
the P0303 code indicates a cylinder 3 misfire. There are multiple potential causes of a misfire, but most commonly it's an ignition coil. If your plug did blow out of the head, depending on the quality of the repair you may have damaged ignition coil wires, bad coil (if they didn't replace it) bad plug (if they didn't replace it) low compression, etc.