Bad service

I am a 62 year old pensioner who bought a laptop on the 17th May 2025 and it was not working well. I returned it on the 23rd May 2025 as it kept on switching off. I was told that it needs an update. I did not use it until the 14 June 2025 where it was giving the same problem. I returned it again on the 16th June 2025. I was told that it should be repaired as it is after the 7 days which is admissible for refunds. I have actually returned the laptop within 7 days and had they refunded or exchanged then we would not be sitting the this problem. On the 24 June 2025 I contacted customer service Slindile received a reply that they will not be able to assist the store must do the refund. I contacted the area manager on the 3rd July who ignored my message.