Mitsubishi Air Conditioner Loud Noise Issue

I bought a Mitsubishi air conditioner, believing it was the optimal selection. Nevertheless, apart from the fan, the noise is incredibly disruptive, making it impossible to remain in the room while it's operating. The service came twice and made an effort, but the noise continues. It feels as if tempests are wreaking havoc within the walls. It seems as though the outdoor unit is functioning indoors. I demand a clear-cut resolution, otherwise I would have opted for a more affordable option and taken care of the installation on my own.