Lenovo — service center cheating

Address:

Cuttack, Odisha

I had bought lenovo k8 note 17 months later from online for rs.10000. I have some issue with my speaker in around 7 days. I visited the service center on 03 september 2019 cuttack branch, they received my handset but the very next day i received call from them and they ask for mother board replacement which will cost 13000/- which is more than the new handset price. But i think there must not be such problem as the handset was all right and functioning well apart from speaker issue.
Plz help me