Telkom robbing customers

I had a 24 month smartbroadband contract of 100 Gig day and 100 night. The contract finished last year December, I didn't cancel it because I still haven't decided on a another contract. Then January month's bill came wtih an extra R374 for a 2 gig, a 1 gig and a 50min voice bundle added to my account, a voice bundle for a sim you cannot make calls with, not even to telkom customer service. I paid R750 for 24 months and January's bill is R1120, I went in to a Telkom store, which is pointless, they told me the billing department is going to contact me and I'm still waiting. They ad an extra internet and voice bundles but I still had a 48 gig left of my actual bundle at the end of January