Vodacom Vetting system

I previously had a contract with Vodacom which was paid up in full, when I moved from Vodacom, they left my account status on Open and did not change it to Paid Up.

When I try to apply for a contact, they now tell me that my credit rating has dropped, this is crazy as my credit record is perfect where I pay all my bills on time and never missed a payment.

This is such poor service from Vodacom.