Univercell / Motorola Phone — selling of oldest and defective product

i have taken motokrzr k1 cellphone from univercell in chennai spencers branch...actually it was a out dated model...i bought it in the month of may...the second day onwards i got problem...till now it went four times for service...now totally it is not working...i spent neary 1500 on it extra for travelling and for calls for them...one time they taken for service for one month...i really suffered a lot...they dint gave me even a proper computer bill...they printed wrong imei number...finally they given manual bill...i had 4 service bill...what to do ...i want other mobile of same cost including my expenditure...