Telkom Over charging their customers

I have a challenge with telkom. They overcharge their customers and when you try to escalate things they never get back to you. They never debit on the agreed date, they will debit after few days and claim that it bounced and add penalty fees that increase your account. They always suspend the line without verification. The bill you receive at the branch is different from the bill you get when you call and the bill on the app. I opted to pay through EFT but then they will debit regardless of you paying them and when you ask for refund they tell you that you have paid upfront because they don't refund. It's really frustrating to deal with telkom. I did a contract for data so that my kids can do school work but telkom will suspend you the whole month and never give you back the data even when they were wrong. There's high level of incompetence as they don't do their work, the bills are never updated and they don't care about customer care.