I request a declaration letter showing that I don't owe MTN.

I once app**** for a contract in MTN and they didn't have a foun for a very long period of time, then I went to cancel the application. When doing my credit score MTN says I'm having errears with them. I went to the sort to find out they said, I must wait for 3Days, still after 3days nothing has changed, when calling MTN Head Office they telling me to go to the store. I can't sign my bond due to this MTN inconvenience.