Zero B — Not servicing product if you haven't taken amc

Hi
I have zero-b we moved from kolkata to here as such we dint take amc now there is leakage when we called up the service person came checked the product and dint do anything and went back when we called again we were told since we havent taken amc it cannot be serviced... This sheer cheating of consumers when they want to sell they come with gifts and et al but when it comes to service after buying they say these...