R59 BIS data plan

Iv'e been using a blackberry for a few months and purchase blackberry BIS for R59, according to MTN this allows a user unlimited access to browse the web to my suprise MTN blocks sites under error code 100022 imediatly after loading the BIS and only allows or clears this error a week before the BIS expires.<br> <br> This is in way no giving me value for my money as the BIS that MTN offers runs for a month but I only benifit from the internet bundle for the last couple of days before the internet plan lapse.<br> <br> Please help ...