Useless service

<p>I am a client since 1997. I want to upgrade my data account but Vodacom's system does'nt allow it because it states that my account is in arrears - WITH R0.00. How on earth can one be in arrears with nothing???? I tried now for 2 weeks by visiting Vodashops (x3) and phoning Vodacom about 10 times and everytime they say that the system is wrong but it seems as if they do not know how to rectify it. REMEMBER I ONLY WANT TO UPGRADE AN EXISTING ACCOUNT!!!!!!!!!!!</p>