Motorola / Mobile — to replace the mobile

To,
The manager
respected sir,

i beg to inform you that i am the student of m.m.m engg college gorakhpur doing b-tech from there and i live in lucknow,purchased the mobile on 5/12/2008 and it is not working properly inspite of many reminders they are not repairing it and giving escuses,even my mobile is in warranty period also.Because of some financial problem i am not able to purchase a new mobile.
So plz sir its a kind request to take a serious action against them.so that i can get a new mobile or my money back.
thanking you,
your's obiediently,
shashi prakash verma