Now, wrong billing

This is the second time within a months period that I’m having problems with Telkom. First is how long they took to sort my line out now it’s my billing. They can even help in store with my billing. I took a 10 mb line uncapped for R799 but my account is R1900+ I would like to have it sorted out no where was I told I must pay for extra. Honestly after my bad service would like at least a 50% discount on my one months cost. I want this sorted. And every 3 days I get no answer I’ll be reposting this