Disgursting, *********** poor service Vodacom collections department

I've settled my account 2 months ago and I've been contacting the vodacom collections call centre for assistance with a paid up letter for my account which was handed over. I have never had such bad service I have spoken to the Teamleader Zanele who had promised to get back to me and never did, she ignores my my emails when I call I'm told she's either on lunch or on a manager call and she would get back to me they dont provide any reference numbers .I contacted collections again las week and spoke to a Refilwe who advised she has logged my request and my letter would be sent with 48hours . I have waited considering the Easter weekend inbetween. All I need is a confirmation letter my account has been paid up and closed.