Unprofessional phone call and no positive feedback

Hi. I app**** for a freeme mobile contract earlier this week, and i recently received a message saying i was declined due to credit vetting. Which i cannot understand because my credit score is great. I then contacted the sales dept on 081 10 213. The agent answered, and i told her about the message i received and asked her what it means and why i was declined. She told me that credit vetting is a separate department and she cannot tell me why i was declined. I asked for the contact number of that dept and she said they are not a call centre and don't take calls from customers. I then asked her how is it possible they cannot inform me the reason I have been declined so that i know what i have to do - She never asked me for any of my details to check on their side but instead pretended to ignore me/pretend like she never heard me after i asked her how do i proceed going forward now. I could clearly everything in the back round on her side of the call. Very unprofessional. Feedback on this matter urgently will be appreciated, Telkom.