Consumer Redressal

We had purchased Aquaguard Integra Hilife water purifier in 2009 and since then have been having regular AMC for service. The last AMC was paid for the period from Apr 2014 to Apr 2015. The purifier was not working and we could not get drinking water for almost two weeks and we had to purchase water from outside. The service response times is within 24 hours. We had made 3 complaints between 9th Jan 2015 and 15th Jan 2015. Even after repeated requests no technician was sent. This was very frustrating and goig through the Eureka forbes call centers was least helpful. There was no escalation mechanism. I want to ensure that they do not get away with this type of service. How can I go about it ? Any help will be appreciated.