If you're over 300 cycles it's unlikely you would qualify for a free replacement battery (assuming your battery qualifies as per 'the' macbook battery problem), but you might be able to talk your way into one if you mention that you called prior to having 300 cycles. Either way I'd recommend you stop over to
http://www.macbookbatteryproblem.com for an overview and links to diagnostics before you next contact them. Check out the 'blog' link too, for a couple of links to threads about getting a replacement battery out of Apple.
Best,
ww