Forfeited free minutes

Visited vodacom liberty mall to cancel a contract. Queried if my free minutes would still be available once the contract is cancelled. The staff member had advised that he would cancel the contract effective the 31/12/2015 thus allowing me to make use of the available free minutes. The staff member had to call someone to follow the instructions of the cancellation as my contract has been moved to the new billing system, which took a while.once I had left the store and got home my contract was already changed to prepaid. I went back to the store on Monday,21/12, and the staff member was not at work so I was assisted by another gentleman who was unable to assist as he also advised that my contract was changed to the new billing system and he could not help.he had then escalated the problem and assured me that he was going to contact me the same day to inform me of the progress.he did not provide feedback so I went back to the store and he informed me that he had lost my contact number. I provided my details to him again and still have not received feedback or been refunded my free minutes.