Nokia — to cheak the battery

I bought a nokia 7210 the last year...and now m facing serius problems with it.
For the last two months its battery was losing charge faster than normal. very often it was getting hanged or switched off... and while switching on the mobile sometimes a white screen was being displayed.
Then the musicplayer in it was also not working.
And even more worse..when on 15th feb 2010, , suddenly my phone got switched off on its own and when i switched it on, i found that all my personal settings, messages, calendar notes, recordings(saved on phon memory)...all are lost totally. Even the graphics and tones that i got along with purchase which were in-built in the phone memory are also lost...
And the worst thing which is concerning me the most now is...my phone memory was actualy 26mb(appx)...which now has reduced to only 11mb(appx).
I hve gone to a nokia care where they said hve to pay them Rs.200 for some software updation for which they will give me a 1 month warranty only. Also they said that if i dont update the software in a regular manner, i have to face such problems.
My family is using nokia for the last 7yrs(almost). Even we influence our friends and relatives to buy nokia phone only..but i have to face such problems!!! its really distressing..
i have already made complaints in the nokia complaint section...but there were no response...
i hope u will see to this problem as soon as possible, at least.
plz inform me with a solution...
my contact no...[protected]