Paid up letter

Unhappy client i went to vodacom to get contract now i havw to run around account fully settled in August after they handed it over to MDB legal been asking for paid up letter i spend over 200 rand airtime daily trying to contact them still no resolution vodacom has agreement with them not me.....vodacom ask me to contact call centre or visit a branch no one is interested is this how you run successful business? I need a paid up letter so that i can clear my name because you as company you have fails 😠😠😠😠