********** upgrade not settled since jan

I have been in contact with Vodacom since Dec regarding a ********** upgrade done in Nov 2014. I have been sent from pillar to post. In Feb they apparently settled it however it was not. I have been fighting with them for the closure as it is affecting my credit profile. Mar I call and its still under investigation, April I call and they will send me a paid up letter. I go after them again and finally i get the paid up letter on the 7th may 2015 only to get an email on the 22nd May of an outstanding amount on the same account number that I got a paid up letter for. Today the 26th of May I call them, I speak to Angel from accounts who tells me another upgrade on the 4th of March was done. What the heck does Vodacom want from me and am I ever gonna get this mess solved. I'm flipping tired of this company and I want this resolved before month end.