Bad service.

I recently bought a laptop from Computer Mania, Cape Gate branch. On Friday 2023/08/18 I went and request a Lenovo laptop for my daughter, the sales person told me they have a Asus laptop with the same specs, I declined because I want a Lenovo, he told me that the Lenovo will be at their store on Monday 2023/08/21, we agree that I will wait. On Saturday 2023/08/19 I received a call that if I changed my mind , the Asus is in stock, we agree again that I will wait till Monday. Unfortunately I left on a bussiness trip and ask my wife to fetch the laptop when it arrives. Monday 2023/08/21 I received a call that the laptop arrived, my wife went to fetched it, the sales person gave her a Asus, exactly what we agreed on I don't want. I contacted them on my arrival , I took it in for assessment whith the hope of exchanging it, obvious there will be damages, damages they saw in our absence. They cannot exchange it due to the damages. What I don't understand the store in which I already lost trust, asses the product. Now I sit with an unwanted damaged brand. I rather sit with a "damaged" brand I wanted. I would have never be in this position if they gave what I was asking for .Also if we already reached an agreement the Friday why would they call me the Saturday...I would like if they can make a copy available of our conversation to clear everything. I'm really disappointed in their service as a whole and will escalate this issue as I'm not happy at all. On which basis do they have the benefit in this whole situation of which they're the cause.