Cant do the simplest things / threating clients?

I requested a settlement letter I then sent through the my details and forgot to enter one character to my ID number so then response i got back from Lerato Folotsi (Unfortunately we are unable to proceed with your request, as you have not furnished the ID(My ID minus the one character) number. the responses there after just went more unprofessional from there such as (WHAT would you like to be assisted with?) I then became sarcastic as her email etiquette is appalling thus me being sarcastic, then she calls into my client care department requesting to speak to my manager as I was just rude now lol my dear do not threating clients in any form or manner, by speaking to my manager has no impact on myself so your efforts are futile, I have sent through the automated SMS and email request for settlement letters however it keeps coming back with errors also you know whom I am you as you just called my place of employment and you must be able to bring up my profile by name and cell, so why are you not still giving me my settlement letter to which I have originally requested I am logging a complaint once each five days against MFC till I receive an apology from Lerato Folotsi and until