I am shocked, for a new defective installed air co...

I am shocked, for a new defective installed air conditioning, I simply asked for the replacement of this indoor unit and then there I encountered a wall and a categorical refusal in addition to bad faith.
they preferred to change 3 essential parts (electronic card, motor etc ...)
Taken hostage because it's summer, I just had to accept. (I paid the full price 4600 ) Alas once you have paid, you are nothing.
A word of advice: avoid and think about it !!! not them. Honestly, I had a feeling of a big rip off and on every level.
The managers who took the quote and the order are no longer available or often in a meeting.
I specify that the air conditioning was installed on June 3, 2020 for start-up on June 23, 2020.
So Hitech Colder ??? No apologies, no listening, no compensation? Did I buy a used air conditioning ???
In any case, I keep a negative image and I will not advertise you.
I hope that potential customers will zap you quickly, because a customer deserves ...