Buzzmeeh — Replaced phone battery is not working

I had placed a service request last week for replacement of the battery for HONOR smartphone.
Their technician did replace the battery by mentioning it as an original one [ But its a fake one] and committed that this will work perfectly.
But after 2 days, the battery showed its worst performance. Now it is not keeping charge for even 30 minutes and getting drained so fast.
It's been a week, I am chasing those guys. Every day I am calling customer care and ONLY getting FAKE promises that "This will be replaced today and don't worry sir it is in warranty.".

It is a suggestion, please don't go for this fraud service.