Damage to my car

Owner was dismissive, abrupt, defensive, not willing to hear my complaint. After filling fuel at this garage i left. My car stalled on me because the fuel was mixed with water. Im now sitting with a repair bill. I had a machanic check everything to make sure it was only the water in the fuel that caused this problem. The owner refuses to listen or understand my complaint. In fact he accused me of sounding like a politician because i stated my case very clearly to him. He closed the door to discuss this matter any further & walked away laughing at me!!! Nb: we have drained all the fuel from the tank of my car & stored in 2 liter bottles as proof.....he totally rejected this is from his tanks.