training issue

I write this review with disgust. I have a Discovery credit card now for a few years. Through the years , i never experienced the Bank increasing my credit limit without my permission. To note my account has always been in good standing. Currently i noticed my credit card limit was increased without my consent. My complaint is about the service i received from the consultants representing Discovery Bank. I first called and spoke to first consultant who clearly had no knowledge of the products you sell, reference number ***4 should you want to listen to that call. I was then transferred to consultant "Nkululeko Ntshangase". My question to him was why did my limit increase? His response was i signed for a annual limit increase. All i want is the proof verifying his response as i am entitled to that. He referred my request to his Team Leader "Laerce'Heslop Gaulekata". I was then told they not allowed to send me proof. I asked for a reference number advising my call and ironically the system could not issue a reference. In my opinion this is a training issue with the staff members which in turn gives the organization a bad name.