I am paying another company's bill

On the 16th of September 2015 I visited the Vodacom branch next to Game in the Mooiriver Mall where I requested change of ownership for number *** from a corporate owner MedFour (Account nr B***-2) to Me L. Els. I supp**** Vodacom with the request on a company letterhead as requested. Instead of changing the ownership Vodacom changed the banking details of MedFour to my personal banking details. I have been paying the cellphone bill of four other numbers since October 2015. I have tried to have this rectified telephonically and have also revisted Vodacom on the 7th of January to have this corrected. The amount of R6717.08 has been wrongfully deducted from my personal ABSA account by Vodacom. I received an sms from Promise Nkabinde on the 17th of January that the banking details change should be done at the Vodacom shop. How many times does I need to go in for this to get fixed!