Bad customer service

I made an application for a healthy device at FNB Connect and was told by the sales agent that my application was declined because my credit profile indicates that I have an outstanding debt. He said they can’t tell me for what is and that I must refer to a credit bureau. I got my credit report and score and it doesn’t indicate any outstanding debt. I called Connect to inform them of this and was sent from pillar to post with the sales department saying it’s the service department that can assist and service saying it’s the other way around. I treat this as an urgent matter as it affects my credit profile and I can’t wait for FNB to get out of festive mood before thinking about assisting me. Somebody had better investigate this and give me answers.