Kent RO — Duplicate/demo machine selling

Address:

Singrauli, Madhya Pradesh, 486886

I have purchased one kent RO grand plus water purifier from M/S Shree Krishna weighing system, waidhan, singrauili on 2/08/2015.some time before it came to my notice that the machine installed at my home is not having any serial number nor the same has been mentioned on bill.Also warranty card was no provided by the dealer.I raised the issue with kent service team and dealer both, but they are consolidating me with free services offers only.No any positive response is given by both of them to clear authenticity of the machine.On pushing the matter dealer is asking me to go to consumer forum or court of law.
kindly take up the matter to solve the issue.