Eureka Forbes — Not attended to complaint lodged

I renewed my AMC for eureka forbes water filter paying around rupees 6000 in early november. The mechanic changed the filters etc. Water was leaking from the inlet pipe during November last and I registered a complaint. There was no response from the company. Subsequently the leaking stopped.
My issue is WHY THE COMPANY NOT ATTENDED MY COMPLAINT WHEN I HAVE AMC ? Surprisingly I received an sms stating to RATE THE ENGINEERS PEFORMANCE..!! I gave a big zero..!! Till date no response from the company. ONE OF THE WORST CUSTOMER SERVICE BY EUREKA FORBES.