Telkom useless customer care

How do I escalate complaint to Telkom accounts? I cancel my Adsl line an Softcap in Feb. The useless call center tells me each month that they sorted the issue and I will be credited. Still no credit and deducting money again for a service I don't use. I am beyond fed up. I feel like they are *****ing my money at this stage. Please contacts of senior personnel that can help at telkom. Can't go on with this.