Utter ******* service

I logged onto my internet banking and was so surprised to see my available balance was reduced by a big amount! Fnb decided to reduce my credit card limit without even a single notification, my credit card balance was positive I was not owing anything yet they took my money by reducing my balance!!! My account was never in arrears and I was never ever contacted about payment being an issue! I want my credit card agreement between myself and Fnb and not a generic one, I want the one that I authorized and signed all those years when I received my credit card and I want my credit limit reverted back to what it was as this is utter bull**** and I will make sure I make noise about it on social media, radio wherever I can!!!!!