L.G — Not providing free Service

I purchased one 1.5 tonne Split Air conditioner on 24.05.2007 from L.P.Electronics, Cuttack, Orissa who is the authorized show room of LG company. the same dealer has a subsidiary named Laxmi Service Centre and it is the authorised service provider of L.G Company . The company has to provide four free services in a year ie, within the period of warranty. On repeated calls one service was provided on 05.12.2007 and thereafter no body listens to complaints. The warranty will expire three days hence. What should I do ?