Telkom is a ****

I spoke with couple of call center agents of telkom, just to name one Nontsikelelo Masoka. She wasn't bad with regards to assisting me. But the service I get with telkom is that they over charge my account. Every month. I pay my account on monthly basis but every time there is a recurring additional amount I have to pay every month. I am told it's for unsuccessful transaction. My question is how do you send a debit instruction to an account that is up-to-date and you charge the account holder R200 and something. Is Telkom a **** or what must I call it? All their call center agent gives me a wrong email address for me to direct my complaints. Is this the company that we should trust. Now my account is being suspended. They don't even sent me the invoices or a message confirming that I have paid the account.