Not refunding me after goods have been returned

I logged a complaint on Hello Peter after struggling for almost a year to return a device and cancelling a contract. My original request to cancel the contract and collect the device was done the same day the device was delivered to me in Nov 2014. Julian was helpful and confirmed via email once they receive the device they will refund me with the R1 578.66 i had to pay to prevent me from being blacklisted due to Vodacom's errors. The device was eventually collected by them, but Julian then stopped communicating with me. They now have my money and the device and ignoring the weekly emails i have been sending them. One would expect that in addition to the refund a goodwill payment should also be made for the time i lost and frustration i went through over a year to correct an obvious error that Vodacom confirmed making.