refund needed from Closed account

I have been struggling for months now trying to have the amount of R3,140.98 refunded back to me as I am no longer a Vodacom Subscriber.

I have contacted Vodacom with regard to this matter and they have no record of my account I ********** -6 (which makes sense seeing that my contract ended last year 2016 and seeing my account is paid in full).

They referred me to the legal department and I have been struggling to get hold of anyone who can assist me. Legal refers me to client services and seeing that client services can see that I should be refunded but they struggle to complete all needed steps???