Frustrating Harrasment and Service Delivery

After double debiting me, I made arrangements to return the debit after calling 111, vodacom refunds me as well which i find out too late, call 111 and been advised that I will be paying R100 as a penalty. After logging a call and the eventually they call me back they agree that the R100 will be credited and can be double debited at the end of the month. I get a voice recorded call three times a day asking for payment. This is very frustrating and has led me to a point with where I will look for another service provider. I have 4 lines and plan to terminate and not renew with Vodacom. I was previously very happy with Vodacom and always found a good deal, but after making a mistake on my account I am being penalised, inconvienanced and now harrassed. Mistakes do happen but inconvienance and harrassment is not acceptable, I am currently due for and upgrade and which I was looking forward to but now I am set on cancelling. Vodacom, please can Vodacom stop send me that annoying voice recording and at least try to keep a client.