Mavis Discount Tire review: Oil change

On receipt oil change completed. 6 minutes from leaving their oil light and engine light comes and car stops. Checked my oil stick since oil light was on. NO OIL IN CAR. Call back soon as oil stick check. They gave me the run around. Finally picked up car on Monday saying they will replace engine. This has really inconvenienced me getting to work and school. Ask for a rental and no response. Please help