Continued bad service

In July 2017 I upgraded my sons phone but when I received my account I was not charged being honest I notified Vodacom and was told it would be resolved. But Aug and Sept still no charges each time I contacted Vodacom to tell them that I OWE YOU MONEY!!! Finally in November I get charged but R500 more than the agreed contract. I then tried to open the invoice to see ecactly what I was being charged for and the invoice won't open so the end of November the debit order with an extra R500 goes off my account. My querie is now escalated (this in itself is a joke) I get an sms to say my problem is resolved (which means we dont know what to do do lets pass the buck) December account still reflects the incorrect amount I call "customer service' and get NOTHING but we have sent it to our solutions department. I call Vodacom EVERYDAY - what else do I have to do? And EVERYDAY am told "your query had neen escalated to our solutions department. With the end of January approaching I just into that famous customer service dept and guess what ??? STILL BEING OVERCHARGED. Vodacom don't care about thier cudtomers (I have only been a loyal customer for 22 years ) and the cheek of it is the are overcharging me but cannot explain or give me a breakdown of my charges. Of course if I stop the debit order they won't hesitate to cut me off and no doubt deem me a bad payer. To add insult to this my son's data keeps disappearing - even when all apps are closed??? I have just called Vodacom and was told BOTH my queries have been escalated to the solutions dept. I am beginning to think there Vodacom dont have such a department. Without question THE WORST SERVICE I have received in years. Would I refer anyone to Vodacom .....NEVER NEVER NEVER