Incorrect billing and bad service

I transferred my corporate number to my personal account at the end of March which became active on 1 April 2015. I explained to the Vodacom representitives several times that charges prior to 1 April need to be billed to the company i used to work for as i was still an employee of the company during March. I was told that this would be done without any problems. Last week i called the call center and they told me it would be sorted out but i still received an invoice with all charges to me. I called the call center again on Monday with ref *** and the agent tells me that nothing can be done and will ask her supervisor to call me back on Monday and still 2 days later i have not received any calls on this matter. This is terrible service and I do not understand why there is different information being communicated to me.