Can't get IRP5 certificate

My mother passed away in 1998. She was a teacher in the Eastern Cape, I now live in Cape Town and have been advised to file a tax return on her behalf. I was told to go to the Eastern Cape for her IRP5 and when i got there, they gathered her documents and i was told to wait for two weeks because it has been requested from the head office. I told them i have to return to work to Capw Town and I was advised to call in those two weeks to check if it has arrived. I called on Monday which was after the two weeks and was told to call Tuesday which i did, but no one had any information for me or any update. Its very frustrating for me because i cant afford to just travel to the Eastern Cape every time i have a query. Can anyone help me make this any easier? My contact number is ********** 517.