Telkom charging me the incorrect price

Telkom have charged me the incorrect price for my package. I have called in numerous times for this to get sorted out and I keep getting told to speak to different departments. Just seems like no one can help me. I call billing and they tell me to speak to sales. I call sales and they tell me to call billing. I can’t keep calling in to dispute my invoice every single month just cause Telkom cannot update my package and charge me the correct amount. And in any case, the refund is not the correct amount. This is extremely frustrating. Unfortunately I am part of a gated community so I cannot go with another ISP. But if I had the chance, I would cancel my service with Telkom in a heartbeat. The service I have received is terrible.