Voltas Vertis Split AC — nil service

Address:

Golaghat, Assam

we had bought one voltas vertis elite split ac 1.5 ton on 13th Jan' 2012 from M/s Swagat Electronics, K.B Road, Jorhat.
the ac started developing problems in july end. accordingly, we lodged a complaint no. 12au0603769, and also received a call from the local service manager, Mr. Roy. the service manager has always been misleading us, by telling that the mechanics will reach our place today, tomorrow, till date when I am still waiting for them by skipping office and writing like a fool again. Interestingly, we had called a number of times with repeated reminders to both the toll free numbers and the local manager. but still there doesn't seem to be any effect. what to do with these guys? can anyone pls guide?

C. das