Telkom overcharging on contract invoice

Hi. Telkom has been the worst service ever! In the past 2 months I’m being billed for things I don’t know and that make no sense on the invoice statement. I have enquired and was told I tipped up on the contract data which is complete nonsense because that SIM card was not used at all. I have since cancelled my contract which was expiring in this month In time and have now received yet another bill that makes now absolutely no sense! You guys are daylight ******s and should be ashamed of your service! I cannot wait for this contract to end because for the past 24 months you have been overcharging me for things that make no sense and fail to give valid reasons, never again!