Flipkart — Motorola AC not cooling

Ordered Motorola 1.5 ton AC from Flipkart. It has been installed in the hall. The hall area would be somewhere between 150 and 200 sqft. We turned on AC for 3 hours with 16 degrees Celsius and turbo on, the ac doesn't cool the hall. We were using a windows ac earlier. That was cooling the room where it was installed and also reducing the temperature of entire house if we run it for long time.
The installation folks from jeeves are not knowledgeable. They told the following things when we complained that the hall is not getting cold:
Window AC is more powerful than split ac.
Hall space can be the issue.
The weather is hot outside.
Running on turbo will damage the compressor.

The AC did not have any plastic cover when it was taken out of the box.

The technicians have visited twice. They don't seem professional. First day they told everything is fine. Today, they accepted that there is cooling issue. They are blaming the product company telling this AC has lot of complaints. But in the end he mentioned the AC can be fixed but cannot be returned. I don't want a defective product. I simply want to return this. I don't want a replacement. I am extremely dissatisfied with the way everything was handled by flipkart. I reported the issue the next day after the product was delivered. They told me the issue will be resolved and today they cancelled return request. It's already 14th june. I want this to be resolved.