Bad service from Telkom

I have a contract with Telkom ********** 145. Contract agreement was to debit money from my FNB bank account. My subscription amount was R200. Last year they stopped debiting. I went to Telkom outlet several times to report that my bank account was not debited and they promised to investigate and report back. Now the money i owe has accumulated to R1770. I called yesterday to follow up on investigation since they didn't come back to me as promised. I was told my contract has been suspended which i am happy about it. Now i want to arrange for paying back their R1770 they tell me i have to pay in 3 installment. I explained to Telkom that i won't afford that and will continue paying R200 as per contract. The reason i took R200 contract is because i can only afford R200. I ask them to cancel the contract so they stop charging the subscription because the contract period has ended. I was told to cancel on self service on the Telkom website. The Telkom self service is a **** it took me more are than 3 hours before i can complete the cancellation process. After completing the process i received a message that they will call me to conclude the process. Today i called again to follow up on the call for completing the cancellation and was told they have 7 days turn around . Why do i have to wait so long for cancellation? While i am waiting for their 7 days turn around they will continue charging me subscription. This is day light *******.