Creating problem where there is none (Credit Card)

I have an credit card with Nedbank and was retrenched 4 years ago. Maintained the account in that period. Saw that I had insurance on retrenchment/and was paid. Then my account was blocked without notification. Account was conducted in a very good manner. When enquired I now needed 3 months bank statement and 3 months salary advices. 4 Years I have been maintaining acc without any late payment and conducted in a good manner. Now I was told by Alex v Wyk that I need permanent employment as well. Does any one know if there is a clause in the Credit Act that disqualifies a person from obtaining/maintaining credit if employed on a contract basis. Laid a complaint with complaint "line" 2 days no response. Alex is also quite. On my bond I have P-2% a good client, my bond has also been paid off 3 times. What is the problem with the CC Nedbank.