Samsung unable to deliver the goods...!

I visited the Century City Samsung Smartcare Centre on Friday the 17th of October 2017, I was assisted by a man who identified himself as Elcardo and said he is the manager. I paid for a new Galaxy Note 3 battery as well as a screen repair (I have the receipt and book-in form), but was told they do not have stock on hand and that they will order stock and that I should return the following Tuesday 21 October when my screen would be repaired while I wait within an hour. I arranged to have the afternoon off from work, went to Samsung and found Elcardo who said they still do not have stock. He assured me they would get stock and call me when they are ready to fix my phone. He even said he would arrange a driver to pick up my phone from my work. He never got back to me. Repeated messages to his cell phone get delayed answers with promises that he will find out if there is stock and get back to me, but he never does get back and lately he had stopped responding to texts. He also does not answer phone calls. It is nowthree weeks after I have paid for a service which I still haven't received. The responses I get from Elcardo are sweettalking promises with no results. It seems that I will not receive what I have paid good money for - that is tantamount to theft. I am very unhappy and disappointed. The staff at Century City Samsung Smartcare seem ill trained to do their jobs. It seems as if they do not know how the business works, there are clear communication gaps between the reception staff (who seem clueless) and the staff who actually do the work (who know what is going on). They will say anything to pacify customers. This manager Elcardo seems poorly organised and totally ill-equipped to manage the shop. I have stood by while he makes promises to other irate customers too when they complain about poor service.

PLEASE SAMSUNG DO SOMETHING, I'M BECOMING DESPERATE!