Lenovo — speakers not working. on the lenovo vibe k5 note 64gb

I buy a lenovo vibe k5 note 64 gb 2 months ago on 15/05/2017 and faced a very big troublesome problem that my phone speakers all the speaker both front and back side and audio jack and mic stopped working and i reached a service centre but they said that they will need 5000 fees for repairing the hardwares manufacturing defects but the phone was in warranty period they didn't even listen to me that this phone is in warranty they said if i will don't gave the money they will don't repair and i asked for replacement or else i will reach a consumer court for complaint but they didn't listen and they didn't repaired my phone this was a very bad experience of mine from lenovo company it is a fraud company my all 13000 rupees gone to waste beacause i bought this useless manufactured defective phone i am very sad i will never buy a lenovo branded products in my whole life lenovo is a cheap fraud company