Sony Ericsson — taking money during warranty period

Address:

Bangalore, Karnataka

I have bought sony ericsson XPERIA X mini pro on jan 4th 2011, the prob i got is not able to receive anything through bluetooth so showed mobile to authorized sony ericsson certified service center they told its software problem and you need to upgrade the software, i told them i got this mobile like this only and its under the warrenty period only.but they told company asked to charge 200rs for software upgradation even it is in warrenty period also.i used almost all company's products like nokia and all, they ll frrely upgrade the software for 1yr.And this is not my mistake also because i got this mobile like this only.And the worst part is the service center people didntt write in bill as well as in job sheet that its under warrenty period they just written no warrenty.
Address of that service center
#971,G.K tower ,1st main, S.T.Bed,
4th block,Koramangala
B'lore-560034
ph: [protected]/300

thankyou,
Dipu ps.