Vodacom Online shop application

I've app**** on Monday 22 July 2019 online for a contract. The next day called and asked how far the process was only to receive a reply that the vetting system was offline. However, they took down again my details making me wonder if my application was captured. Thursday evening I called again and the answer was again that there were problems with the vetting system, but that the lady will call me back on Friday before 12:00. What happened I had to call back asking if I was approved only to be told that it was declined. No real reason could be given as the call is recorded. If it is because of my credit record, my questions are how can this be as I always pay my accounts on due the dates, I get regular offers for a credit increase such as on my Edgars account, recently my silver credit card was upgraded to gold. So how is this possible? Also, why send me an e-mail to open my Vodacom online account?