Defective Charging dock

On 21 November i purchased a magnetic charging dock from vodacom store Eastgate. the Dock was used twice and the magnet came off. I took this back to vodacom and have been told on 4 occasions that they do not have stock as they waiting of the supplier and i must come back. In the interim the loose magnet has been lost and now vodacom is holding me accountable for this and not willing to refund me on the purchase. I have recieved nothing but terrible service from Vodacom and am utterly disgusted by their attitude. I will not do any further business with vodacom and will urge everyone i know to stay away from these lousy *******. I could have instead donated My R509.00 to a charitable organisation instead of Vodacom.