Unable to check data balance for modem

I have phoned Vodacom customer care numerous times with NO POSITIVE RESULTS!!<br> Here is my problem:<br> I use a 3G Modem (****le) on my laptop to connect to the internet.<br> To view my data account balance, I log onto [URL Removed] and go to Account. But every time I go there it reports \Your data account balance is 0 MB of data