Pathetic Customer Service

After going in to two different Vodacom stores at the end of November and being told my account was up to date and then receiving an invoice yesterday that my account was in arrears and I needed to pay almost R2000 at the end of this month. I called the accounts department, after explaining the situation to him for almost 20 mins the phone cut off, I then called again where I spoke to a woman this time explaining the situation yet again I asked this obnoxious lady to put me through to someone who could assist me better and she put the phone down in my ear. I called a third time and when I asked the consultant if I could be put through to her manager as I didn't want to explain myself another time she refused and hung up. I think this is ridiculous for me to pay for something without knowing why. I refuse! This has definitely been the worse customer service I have received by far. I suggest Vodacom gets more competent people to work in their customer care department.