Formal Complaint Regarding Unprofessional Conduct by Staff Member

Dear Customer Service Complaints Department, I am writing to formally lodge a complaint regarding the conduct of one of your employees who contacted me telephonically on my number *** today at approximately 08:04. The caller introduced herself as Stacy and contacted me from the number ***. During the call, she spoke very softly, and I politely informed her that I was unable to hear her. Instead of adjusting her tone professionally, she abruptly raised her voice in a manner that I found rude and disrespectful. When I questioned why she was raising her voice at me, she responded that it was because I could not hear her. Her tone and manner were extremely unprofessional and completely uncalled for. I am deeply dissatisfied with the way I was treated and request that management review the call recording for quality assurance purposes. I would also like to receive a direct apology from the staff member concerned. Such conduct is unacceptable, and I cannot tolerate being spoken to in this manner. Should this matter not be addressed appropriately, I will have no choice but to settle my account and terminate my relationship with your company. I trust that this complaint will be handled seriously and look forward to your prompt response. Yours faithfully