Incorrect Listing because of accounts department

I app**** for a new contract with Vodacom online and the reference number is ME4CL8 and today I was told its declined because of unsatisfactory payments on my last contract with is incorrect as I have paid up the account. I then phoned collections department and the Fezeka Bungani also was not sure was going on the other system should I paid up the account and the other said I am owing I have proof that I paid up the last cent and now Vodacom is incorrectly listing me. The new deal that I wanted is ending today and I want Vodacom to fix this mess so I can get that deal because its damaging my credit scoring with ITC. I demand to have that contract still at the same price it was advertised.