Nedbank customer service

I have a credit card with them. It was blocked without my knowledge. Called their customer service card department, and I was transferred to 5 people before I was told that "sorry we can't help you, please call us Monday". The number *** is not free as they say. My airtime got exhausted. When I asked the consultant to get someone to call me on Monday since they blocked my card without even warning me he told me no, they can't call me, I must call them. I'm disappointed with the service and would like to withdraw my services with them or someone to call me and fix this.