Email send but never deliver, belligerent staff

I sent a email using the telkom webmail as to assure that there's no issue with settings, the email said sent however it was never delivered. The main problem is that the email was a assignment and as a result the assignment was late and would lose a minimum of 20%. I called telkom and they said that there is a problem with the server but would not give proof of this and after hours would only send a email saying I may have been affected.<br> <br> Then today after a week someone from telkom called to check if the problem is still there (which it is) and wanted me to provide them with my username and password, after insisting a few times that I need to give the password and me saying that I do not feel comfortable with providing my password, and that I would send them a email and they could tell me if they got it, they basically and said that they cant take my word for it that its not sending and saying they could only help if I provided my password, I said no and the person from telkom just hung up the phone with no warning.