Poor service and stressful

I bought a laptop on 05/06/2021 at one of vodacom shop(pavilion,KZN) which gave me software problems on the first day. the laptop was to be used for online studies since my previous laptop died. i was having a test on monday the 07/06/2021 which means i had to study for the test in the school LAN. because of that, I couldn't return the laptop the same day or the following day. after the test on the 07/06/2021, I returned the laptop still in its condition, and I wanted to upgrade the laptop to a new one since I lost trust on the laptop that was sold to me. I then requested a refund for the laptop so I could immediately buy a new laptop of a different model in the same shop. until this day, nothing has happened, and this has caused problems in my academics. the rules for covid in school computer LANs have made it difficult for me to study and as a result i have not been doing well in my studies. kindly assist in this regard since this issue has not been resolved till this day. Its costing me money by calling and going to check how is the progress going.