Vodacom Paid-Up Letter Bad Customer Experience

I have been trying to get a paid up letter from Vodacom for my contract that I have cancelled and paid it up. I contacted them many times and Support tickets (Ref *** & Ref ***) have been logged and closed as resolved whilst I haven't received my Paid up-letter. My main problem is that the contract still shows on my credit score as active and looks like am still paying that account, and I cannot dispute that on Credit Bureau without it.

I am very unhappy with Vodacom's treatment :(