Rude client consultant Nkele from Brakpan branch Capitec

I work in a HR department and I recently engaged with a lady called Nkele from Capitec Branch in Brakpan who has a bad attitude towards clients, our policy states that we can only confirm employment in writing i.e email/fax request due to incident we had in the passed years and the POPI conditions. Ms Nkele claimed that she called earlier to confirm employment of one of our employee and alleged said that I told her that he is no longer employed, the employee asked me for my email address which I gave to him and she called to say I told her that he is no longer employed, I tried to explain to her that I did not speak to her but she was very rude and started shouting at me over the phone, She then hang up and refused to assist the employee . She has nothing in writing that I said he is employed, the employee had the pay slips to prove that he is employed and I feel that she could emailed the details instead of being rude to the client with unfounded facts. Please re primand your employee she has no right to shout at anyone, I have engaged with so many of Capitec consultant and they have confirmed employment in writing, who is she to think that she is better than anyone and lie.