Furious client

I took up for an upgrade on my contract, but what I took is not what I am getting, I've been calling the customer service department and they taking me from pillar to post and nobody is willing to help me, I've signed up for 10gb for R99 Sim only and when I called they said I took 800mb for R99 so they said I should go to the branch and enquire and now as I'm typing now I do not have data nor airtime I'm so furious with the lack of assistance that I have been getting and my MONEY IS DEBITED EVERY MONTH but I'm unable to get the service that I want. TELKOM GIVE THE SERVICE THAT I AM PAYING FOR