Vodacom terrible service provider and customer service !!!!

I have been overcharged on my Vodacom account for the month of October- I queried the amount from mid October and the increased amount went off my debit order , I queried again, always been promised that the query is escalated and someone will call me back. No one calls back and now my number has been blocked to call the call centre as I call them too much. My account is showing higher AGAIN this month so I am now querying both the months but cannot get through to Vodacom as they block my number from calling them. Have been a customer for over 20 years and it’s a steady decline in customer service . SHAME ON YOU VODACOM!!!!!