ac compressor

Hi, has anyone experience of issues with the Air-conditioning on CLS AMG63s 2015 model? The garage serviced it and refilled the gas as there was no gas, but its still not working. They say that it could be a faulty Compressor and a genuine replacement part is £750.00. Any suggestions appreciated.

Hi, my car has started making a weird noise. It does it almost everytime I start the car. It lasts for around 30 seconds and stops. Then reappears every 3-4 minutes. I don't notice it when driving, just when idling. I'm really hoping it's just a pulley??? I'm trying to upload a video but its...