Poor Service From VODACOM

Pathetic service I have been over charged on my account since August 2018 and still struggling to get my account sorted (About R300.00 per month). I spend about an hour at a time trying to resolve the issue (being transferred to 8 different people) , I am then told that the service content will be blocked and get a sms stating "All future content service subscriptions & purchases have been blocked" Last month they assured me that my account would be credited and sorted, Guess what.....this month my debit order went off and I was over charged as previously done. (I Don't know what happened to the credit, seems to have disappeared into thin air) The person that I spoke to today (02 April 2019) told me that the credit is due next month so there would be no debit order going off then, but as per my online bill the next debit order due is already over charged (about R100.00). Service is poor. You get told to keep quiet as they are trying to assist with the problem. 14 March when asked whom I was speaking to the lady refused to give me her surname or the surname of her superior as it is apparently against company policy. They can't tell me why this wasn't sorted in the past as the specific person helping at that moment did not deal with the previous complaint and that the previous person just said that they would sort it and never did so.....do they not keep a record of this? With every call that you ask to speak to a manager you get told that there is only one and that she is busy, you can't hold the line as it is a call center and that they have customers to assist. Am I not a paying customer that deserves to have an account rectified?