Competition not worth entering!

I'm very disappointed with the phone call I received today. I've entered the R2000 voucher competition on Facebook today when I received a phone call from a lady regarding the competition. She asked me to verify some information then asked me what my salary is. When I told her it's confidential and I'm not comfortable answering she started yelling at me that I HAVE TO answer. Again I explained that I'm not comfortable and that I have people around me she yelled at me saying "then why did you enter? It's useless talking to you" and hung up! I'm currently pregnant and because of THIS, I'll never buy anything from you! Very bad client service!