A whole month without device

at the end of November 2014 I upgraded my contract to a data deal and took the Acer Iconia W511 Tablet/Laptop I waited to weeks for the device and was never contacted when the device arrived at the shop. A week later the device became faulty and i notified the store of the device. I have taken in the Tablet for warranty assessment, but its now been more than a month from handing my laptop and all i get from the store (Yolande brand) are excuses Like \is there is no stock"and \""the warranty assessment is not complete\"". I took upon myself to Phone the area manager (Willie Van der Merwe) And explained the situation to him"