Supp**** false info on sign up

I app**** for the gig4gig account with the uncapped bolt on. I explicitly asked whether or not it applies to public holidays too since, like every other person in SA, I'll be home on public holidays, most likely using the Internet. The sales lady said yes that I will have the uncapped on public holidays. 1st of May was a public holiday, they billed my traffic under the gig4gig and not the bolt-on, now I'm capped. No Internet during peak hours. I feel cheated. I'm not getting the service that the sales lady said I would. The usage billing on public holidays was one of the main reasons why I signed up with vox. I still have the mail from the sales lady confirming that public holidays are included in the bolt-on deal.