Refund

I purchased an Experia E4G at Alberton Vodacom almost a year ago and have only used it for a few days. The phone had numerous problems and I returned it after a few days. It was kept by Vodacom for about 2weeks or more, then exchanged. The second handset issued, did the same. i took it back to Vodacom, and thats when trouble started. I struggled to get the second handset back and when I finally did, I was told there was no problem with it but was experiencing the same issues. After numerous emails and fights with Michelle, The handset was taken in and Sean Gibbons promised to have me refunded. Months later, I was told my handset was ready for collection. I have since bought myself a new handset and do not understand why Vodacom refuses to refund me my cash back when they have literally owned a handset that I paid them cash for but never got to own or use. Calls to Michelle and Sean get me nowhere, I can never get hold of them. i have also sent an email to Vodacom complaints, without receiving any response.