Multiple service failures to a longstanding client

I have been a loyal Vodacom client for at least the last 15 Years. However the service I have received of late has lead me to question this. On 3 March I Received an automated call indicating that there is an outstanding amount on my account. I found this strange as I pay via debit order and received confirmation from my bank that the debit order was successful.<br> This was the first in a string of service failures: 1. The consultant even when prompted offered no apology for the 20 minute holding time. 2. The consultant admitted that the billing error was Vodacom's, but could offer no explanation. 3. When I requested what I can expect Vodacom to do about improving service I experienced an attitude of \I don't want to deal with this\" from the consultant who proceeded to put a Manager (named Thabiso) on the line. 4.When prompted about all the above, he attempted to apologise, but could also offer no explanations on my questions any more than telling me that a call had been logged and that someone will contact me within 24 hours.5.I receive an SMS stating that someone will contact me within 2 working days, contradicting what I was told.6. It is least 4 business days later and no call yet"