Bad service Vodacom

<p>En January I phoned with a querie on my account, one of my cellphone lines were charged twice, the lady said that she will log a call for the extra amount to be discounted. End of February I paid the amount for Feb outstanding and I phoned Vocacom to check if my account was paid up and the consultant said the account is paid in full, the reason I wanted to know is that I wanted to go upgrade. So I then did upgrade and there was no problems, then since yesterday I am getting calls that I owe R800. I phoned today, they put me through to Collections and this guy told me that the credit note was never issued and they will have to investigate but I need to get a service request reference number from client services department. So this consultant put me through to the client services but there was no answer. I am sick and tired of having problems with Vodacom. How can they tell me at the end of Feb that my account is 0 and now they telling me I owe R800, I do not understand that!!!!!</p>