Canon - Canon new printer cartridge not working

I bought a new canon ****s printer on **.**.** Thru Reliance digital palakkad showroom for rs. ****/-. At the time of purchase they promised that minimum *** prints can be taken in this printer. But after printer **-** copies the cartridge shows replace catridge. I contacted the agent and they told me return it to check. They returned it in *-* days saying its ok now. After reaching home i found the same complaint with the complaint. At this time the agent told us to contact cantact service center. Canon service agent says the cartridge is replaced or filled so nothing can be done. The cartridge costs rs. **** which i am not agreeable. I feel reliance digital and canon cheated me by giving me a wrong or old or unmoving product.