Worst service experience by sarcastic manager

In March my SX4 went in for a service. The car went back a wk later because of a rattling sound in the engine bay.Rene said it was the splash tray that had been damaged and a piece of loose plastic was the cause of the noise. I took the car somewhere else & within 2 sec of opening the bonnet, the problem was spotted. It was an earth cable that was left to hang in the alternator belts which caused the cable to be shot out by the belt against the car body which made the sound.On Tue the water pump & thermostat was replaced, We fetched her car & this time the aircon was not working. We went back on Wed.This time Rene said the gas was empty.This was not the case when we dropped the car off.After being told by Rene that we couldn't prove that it was them(His mechanic said he didn't do it. Do you think the would own up to it if it meant that he had to pay for it?) & he would not replace the gas. Basically calling me a ****. I have confirmed with a mechanic that the water pump could not be changed easily without loosening the high/low pressure valve which when released will leak the aircon gas.I told him that his customer service was pathetic to which he sarcastically agreed!