Warranty not provided by dealer and General Motors India

On 23 July 2015, I purchased Chevrolet Sail Diesel. I made this purchase at Thane, Maharashtra India. The vehicle covered under comprehensive warranty of 3 Year or 100,000KM. There are some repairs to be done in car under warranty. But the dealer is not providing the warranty saying that car was serviced (Routine servicing) outside their dealership. Hence I wrote to the General Motor India (GMI). But GMI & Dealer both denied the warranty say same. According competition commission of India notice Case 03/2011 Dated 27/07/2015 whereby it's mentioned "OPs are directed not to impose a blanket condition that warranties would be cancelled if the consumer avails the services of any independent repairer. While necessary safeguards may be put in place from safety and liability point of view, OPs may cancel the warranty only to the extent that damage damage has been caused because of faulty repair work outside their authorized network and circumstances clearly justify such action. " Please help me with path forward.