Shocking call Centre agent

Somehow my credit card limit has been exceeded over and above my normal limit, a FNB representative called me a treated my like absolute dirt, he was in-polite and blatantly told me to keep quite and listen to him, i am absolutely appalled

I will not deal with another call centre agent, my private banker can call me to resolve the issue with me, why am I paying almost R400,00 in service duties for a rude call centre agent to call me.