Vodacom debits full amount for upgrade phone and charge monthly installment

The company did a two year upgrade at Vodacom on a existing line and with this we got a new handset to be paid over two years. We then did receive our new contract and our new phone . But then the problems started. First, we got debit ordered for the full 15K of the phone. Then we phoned them and after numerous calls we still have not received our 15K back. And to make it worse we are paying a monthly installment for the phone that we have already paid incorrectly!! I then e-mailed and spoke to Vodacom and the lady in the department was Sandile Mbatha

From: Mbatha, Sandile (Outsourcing), Vodacom South Africa (External) ********** Sent: Thursday, December 13, 2018 5:45 PM To: Desiré White Subject: Vodacom Invoice U ********** Good day I trust you are well. Please be advised that the invoice U ********** for cellphone number ********** 898 with the amount of R14718.85 was charged in error. The credit has been created and will be loaded on your account B ********** by the next bill run. I apologies for any inconvenience caused. Team Leader ********** . She said it would be resolved ASAP .

Unfortunately nothing has been done. Vodacom I am use to better service on our business account with you. This has been a shocking experience. To take 15K per debit order *******ly and now not wanting to give it back?