bad service and false advertising

my experience with telkom mobile has been horrible. i got a phone for my sister on contract in February, the initial agreement i made with them was that i should pay R100 so they can deliver the phone and i will pay R160 per month on the 30th of every month. the problem started when they started debiting extra money from my account, an amount i did not agree on and on the 27th so i reversed the money because it was too much and my account has been blocked since then THEY KEEP ADDING INTEREST FOR AN ACCOUNT THAT IS BLOCKED I AM NOT USING THE AIRTIME OR DATA LET ALONE THE PHONE BUT THEY INSIST THAT I NEED TO PAY PENALTIES FOR SOMETHING THATS NOT MY FAULT, the weird thing about this is that i keep getting different information from different consultants and i didn't even a sign a contract with them this is so frustrating because they are sabotaging my credit record and making seem as if i am refusing to pay my monthly fees.