Unsatisfactory service

I am extremely irritated by Vodacom's poor customer service. I have requested a paid up letter on numerous occasions which they failed to do. I spoke to a few consultants who promised me that I will receive the letter once I drop the phone, which never materialized. This is highly unprofessional and totally goes against what Vodacom advocates regarding customer service. I will appreciate an urgent response. As this is reflecting negatively on my credit profile. Vodacom Account details: I***-7 Email add: ***