cheated me by giving damaged encyclopedia britannica cd.

Location/place: Bandel,dist:hooghly,p.o:bandel,pin:712123

Name of company/service: Student

i have bought a Encyclopedia Britannica DVD suite 2012 ultimate reference guide from www.britannicaindia.com on 14.07.12.But as soon as i recieved the product and tried to play the dvd it did not play.i telephoned them and they told that they will replace it.but when i send the damaged dvd they send me the same dvd.please do the the needful.i have the original reciept copy.