Horrible experience with Capitec

Good day

I have a complain my account was cancelled and I was advised I will no longer have an account with any financial I institution for what am still not clear?????

I gave card to my son to withdraw money (R600.00) on the 26th of September 2018 which he did then told him to buy food at chicken licken , to my surprise he came back home telling my card keeps declining but there we available funds.

When I went to the branch in alberton I was told am a ********* and will be blacklisted , does that make sense this is my account and have been a client for long, I need clarity on this and want to escalate this to the highest authority at capitec or banking ombudsman