Taking ages to replace out the box failure

Last month, around the 6th Jan I sign a new 24 month contract for a tablet, all goes well. I notice the next day the tablet has no sound unless you use ear phones. The day after that I return the tablet to Telkom Greenstone. They inform me that I cannot get an exchange immediately, the unit has to go for repairs first. I agree as I can understand that they have to ensure the tablet is not working properly. Now about a month later no-one at the Greenstone store can give me an update on the replacement of the tablet, I have no tablet and need answers, this is an out of the box failure, so I need this tablet replaced ASAP so I can actually get some use out of it... come on Telkom Mobile, speak to your supplier Huawei and get me a replacement device ASAP.