Rediff Online Shopping & Bansal Computer-Delhi (Supplier) — supply used, non working, out of warranty product

I ordered Intex W150D ADSL wifi modem to Rediff Online shopping by Order No[protected] Dt.12.05.15. The same product received to my home by Velocity Courier No[protected]. The product received to my home on Dt. 16.05.15 through Cash On Deliver Option. After opening box, i found product supplied by seller Bansal Comuter is not brand new, it is used. Also Sr. No. on product erased by marker pen and not matched with item box Sr. No. Also Sr. No. not mentioned in Invoice(without tax paid). Product not working properly and Yr.Of Mfg-2012(out of warrenty).