Due for upgrade bu cannot be helped

I have been contacted to upgrade my contract. i requested to upgrade to Samsung Galaxy J5 Prime 16GB Black + Samsung Power Bank 3100MAH on free me 1Gb for R199pm. it has been 3 weeks now and still being told no stock of the power bank...i dont care about the power bank now. if vodacom can give you the device now and the additional device when in stock why cant telkom???? why cant i be sent my J5 and i can collect the power bank when it is in stock? or it can be sent to me? or why cant i get the J5 on its own on a 1GB contract?