Mitsubishi Electric India — 2 ton AC bought back in 2017 and still cant use it despite spending money many a time

Hi, I bought a Mitsubishi Electric 2 ton AC for domestic use and shelled out a lot of money for installation believing that the compressor needs to be set up on the terrace only ( as told by the salesperson), which resulted in higher installation cost and I came to know that there is no such policy later on, when I had to raise a complaint for my AC. The machine never worked properly and right from installation, we could not use it. Even to this date, I can’t sell it or use it as they keep on coming and telling me some spare is needed. And they do not procure spare parts on time. I have a useless machine, a faulty piece sold to me and I am fed up of all the mails and talking instead of getting use out of it. I should get damages for all the stress this whole exercise had caused me.