Unhappy with service

I went to the randburg multichoice branch to purchase a USB Drifta . I was assisted and the purchase was concluded , the service consultant tested the device and could not pick up any channels.She advised me that the the battery of the drifta was low and I should test it and call the call centre if there are any errors. I tried the device but it is not functional. I then called the call centre only to find that they cannot assist with me with my issue and that I don't have coverage in my area( But I checked the map and meredale is there). I then asked what is the refund policy and I was advised that I cannot get a refund, that is not acceptable as the device is of no use to me if I have no coverage and further more, why did the service consultant not test a different device or at least advise me that coverage is based on the street and not the general area.