Irate client

I called clientele and I spoke to Itumeleng and had a discussion about the matter at hand and he took the contact details of the person I have issues with he needed her email address and I called to give him the email address and I spoke to Given who had an arguement with me when he wanted me to repeat what I discussed with Itumeleng and I asked to be put through to the supervisor and he refused and he said he was now a person assigned to him and I said I don't want him to be dealing with me because he is more argumentative other than being helpful