Shutter by terrible service given at Hifi Corp

I bought an i5 laptop at HiFi Corp, William's Hut PE on August 25th 2018.. On Sep 26th 2018. I took it back because it was faulty. I was then told that i would have to wait 21days working day. The manager Celeste then assured me that I would not have to wait that long. After 2 weeks I went back to enquire if my laptop was back, the securities asked Celeste and she said no. Last week Thursday I called to check if my laptop was back yet and when I did, nobody had an idea what I was talking about. I got transferred to a guy by the name of Clinton who did do a follow and only the 24th of October called me back asking for the receipt. I then emailed him the receipt. Today, on the 25th of October Clinton called ne back and asked me to come in store to collect a new laptop. I get to the store and I am not told that they dont have stock and the laptop I purchased was being discontinued and they dont have anything to match the value and specs.. They offered me an i3, mine was an i5, I refused, they offered me something else from a different brand and I refused saying that I want the exact same thing that I got. I was then told to take a refund and I refused the refund and told me that I want a laptop because that is what I gave them and why should I make it easier for them just because someone didn't do their job on time... I left the store disappointed because I did not have my laptop with me and that I would have to wait another maximum of 1.5 weeks.. before Clinton took over this matter nobody made any contact with me regarding my laptop, I have wasted time and money going back and forth to the store and making calls trying to find out what is going on. I am completely shuttered by the service that I received from the staff at Hifi Corp let alone the manager. I was told to wait for a maximum of 21 working days and I have, why can't I get my laptop back. Why should I wait?