Telkom Mobile Application Delay

It's been 1 week now awaiting a response for a Telkom Mobile application. Firstly I had not heard from them for 5 days, then eventually Sales Dept. came back stating there was an outstanding account with Telkom. I was advised to call Billings Dept. I did and a Zaheera Pietersen confirmed nothing was outstanding. I conveyed this message to Phillip at Sales Dept but to date have still not heard anything from them. How is it that Billings Dept. advise Sales Dept of an outstanding account only to find that there is no such account on their records. I had to verify this and still no response!!