Exchanges take a life time

I received a defective product from Groupon. I then called the call centre and asked for an exchange and was told a courier will collect it.2 weeks after it was collected I have had no response. One month after they collected the products , I was informed that the stock has arrived.6 weeks later I still never received the products and then spoke to David from Magic in the box (I have been dealing with him the whole time) And he promised I would receive the products by no later than Friday 22nd May 2015. Monday 25th May 2015 I then contacted David again , he then sent me a number for a waybill that I can track the product , Sure enough the product was released on Monday (The week before I was promised by David he will send it before Friday the 22nd ,I believe he **** )On Friday the 29th May 2015 I have still not received my products and now also contacted Groupon informing them of the bad service. I then liaised with Sibulele who retrieved the waybill with the signature of the person that signed for it , that person does not work and my work. To date I have paid for a product that was defective and have still not received my \new"product . I will be deleting my profile"""