The latest call I just received from your agent is quite depressing and bordering on lack of professionalism

The latest call I just received from your agent is quite depressing and bordering on lack of professionalism. The lady insists on changing original access amount because she argues original amount was a mistake from the part of the insurance company. I have already made arrangement with the service provider and no need for her to push this change she wants to introduce over the phone. I told here the communication and confirmation of access already done and in writing and any further correspondence could reasonably also be in writing