Vodacom contract

Hi there, I have a complaint in regards to an contract which I had with Vodacom which has been paid off 2 years ago. I've been requesting for a settlement/ paid up letter for the past two weeks which I'm still waiting on today. Twice already I've been promised that I will receive the letter in 48 hours but yet 2 weeks has gone by with nothing received. The matted has been escalated twice and still I'm waiting. I'm in the process of buying a house and this account that has been settled a long time ago and not updated with ITC is standing in my way of owning a house. I can't be calling in everyday single day to Vodacom asking them about the matter. Can you please help me in this regard. Thank you.