UNCAPPED HOME ADSL, BUT BEING CHARGED FOR DATA - 1.1Gig = R333 !!!

I have an Uncapped Home ADSL package with an integrated sim card (1 Gig free data monthly) with a total monthly cost of approximately R615. At the end of February suddenly I receive an account with an additional R333 added for DATA CHARGES (1110 MB). (1) Called customer care, in the presence of supervisor, agent says it's a billing error and I have to pay full amount to avoid line suspension, but amount will be credited on future account. Amount was subsequently paid. (2) Called billing department after 2 weeks of logging dispute to enquire on progress. No progress reported so matter was escalated for further attention. (3) Received an sms today (8 April) to say matter was resolved. (4) Called billing department to confirm, only to be told agent handling dispute says I cannot be credited with amount overcharged as it was data I used. (5) Called sales department to ascertain whether integrated sim attracts charges for the 1 gig allocation. Agent confirms that no charges are applicable as 1 gig free is part of the package.

MY QUESTIONS TO TELKOM: 1. Having UNCAPPED ADSL, how does Telkom charge me for data? 2. What data could I have used according to Telkom agent? 3. How does Telkom charge R333 for 1.1GIG??? 4. Why can Telkom not reverse THEIR errors immediately? They expect the customer to overpay, Telkom earns INTEREST on that extra funds and then takes its time to refund customers. THIS IS THE HEIGHT OF OPPRESSION!!!!