IFB - Goods sold is not working since I bought

I have bought a new Ifb *.* ton Air conditioner on **/**/****, I have facing all the problems since the day I bought machine was not cooling well, so I contacted the company they send their technician but the technician tell me there is no issues with the machine, I complaint many times but no response from the company, I requested them for service and check the machine but didn't get any response from company now I call a local technician for service he checked and told me that machine is not cooling enough because of some gas issues, company is still not responding and they said the product of out of warranty I don't know what to do now.