LG Split AC
Non-cooling/Stops cooling after 5mins

I have purchased LG's split A/C on April . the engineers who came to fit the a/c was to able to start it on the first day then next day another engineer came and fix the problem. But the A/c started disturbing from the next month it runs for 5 minutes and stops cooling after that i have complained many times engineers came and fix and again it started giving problem it continues giving problem so i asked for replacement they told they will replace but whenever i call them they delay for 10 days or 20 days.

Now i am frustrated and disparately need replacement cause my warranty will over in few months.