Flipkart — MI robot vacuum cleaner. Invoice provided is not valid

Hi team,

I have ordered for a mi vacuum robot from Flipkart. I have received the invoice which has incorrect serial number of the product printed. Which is of no use. The manufacturer warranty is void.

Flipkart gave me a replacement product after multiple followups for over a period of month. Again the invoice is generated which is also having the same issue. Now they are not at all bothering to do communication properly on the issue nor any progress. I'm totally clueless on what to do next. It is really frustrating to keep on doing followup with flipkart on this issue as aend user.