Advisable to lodge Consumer Complaint with Respective Forum.
Prior to that, pl. ensure that you are having all documents and record i.e. Quotation, Purchase Order, Payment made, Complaints you lodged, Responce received and rectifications of the same, reoccurances - Ultimate denial.
Reg. Warranty pl. ensure once again whether it was for Month &/Or year.
For Similar Products if same Mfgr. is offering yearly warranty, pl. preserve that Quote as well which will be helpful to you to establish descriminating & faulty Trade Practices.
In this respect the basic quotation offered well before placing Order pl. be ensured once again. more