Unsatisfactory assistance Call Centre

My number started requesting a vmail password from Dec 2015. Since I don't know it, I waited till today for 173 to have my vmail pword reset. Spoke to an array of personnel (Sijabulile, Maake, Phyllis, Amy, Margie (?)) and got various responses, to....call 100 again as the pword was reset to 1234......call 100 as it was reset to 0000...call 555 and follow voice prompts....Maake advised he had a technical problem and that he could get absolutely nobody to assist by just taking my cell# and taking it to, e.g. his supie...Margie advised that she had reset my vmaiI and that I could try it after a few mins. Needless to say, I've received no joy!. I had tried to listen to a very urgent vmail, and after the 3rd call to 173, my vmail box was gone! Voice prompt when dialling 100 / 110 / 120? Either \This # is incorrect"or \""This # is not accessible at present..pls try later\"".....since before 3pm today! Your records will indicate that I don't call 173 regarding petty stuff regarding how to use this or that"