Bad service, no response

I returned my faulty Nike shoes on the 1st of November 2015. One of the floor assistants took my shoes to the customer counter and made some calls to locate a similar pair. The Paarl branch had such a pair and he notified me that it will take a maximum of three weeks to transfer the shoes to the Cape Gate branch. After not receiving any notification I returned to the Cape Gate branch on 24 November 2015. I spoke to Trevor and Gershwin. No one had any knowledge of my previous requests , in fact they could not even track the whereabouts of my shoes. Gershwin promised me vouchers or discounts to apologize for the bad service. I have not received anything yet. All I really want is my shoes. Trevor called my wife on Wednesday 25 November and informed her that he could not locate a similar pair. What happened to the shoes that was supposed to be on the way from Paarl. Trevor also promised my wife that he would call her again on 27 November 2015. We have not heard anything from anyone again.