Poor service

Hi, I've been added by MTN onto the ITC list for an amount of about R240. I have settled my bill as of yesterday and have been struggling since then to get a letter from MTN that my account has been settled. I have called and logged multiple requests for letter which apparently takes 3 Days. Re: Contact us Query Other [#***], Service Request Number: *** is Opened, Service Request Number: *** is Completed,Service Request Number: *** is Completed, Service Request Number: *** is Completed, Service Request Number: *** is Completed, Service Request Number: *** is Opened. Apparently managers cannot deal with my request to furnish a letter. I cannot get a phone number for the accounts department cause they only work with emails. Only the legal department can assist but even they only work with emails. The reason I urgently need this letter is for a job application that I was successful in but require a paid up letter from MTN