Defy blaming us for their fault

I had an authorised service centre have a look at my fridge that stopped making cold. The technician came out and said some part rusted through and has to be replaced. The technician kept the fridge running and left. Later on another technician came out for a fault on the freezer. These are two separate systems. He then told us that because we kept the fridge running, the compressor packed up. When he phoned the first technician, that technician said it is our fault because we did not switch it off and it is logical that we should have switched the fridge off. Why did the first technician not switch the fridge off? Now they want us to pay for the compressor. They are waiting for the parts for more than a month now.