Game store refused to credit a Lenovo laptop bought on the 1st of September it's very slow. It can't get anything installed and it take days and takes days to unistall. basically I haven't done anything with it and its only 9 days

I bought a laptop on the 1st of September and in the 5th I've been trying to install Microsoft off professional but it's was very slow and I could not finish and I tried uninstalling it at it took me another day to do that and it did not finish. On the 9th I took it to the store the guy call Reggie did something and assured me that its not gonna give me any problem but later that night I tried installing it and its not and when I took it back they said they can't refund or exchange for me instead I have to wait for it to be sent for assessment and I haven't used this Lenovo so basically I paid R4299 for it to be taken for assessment. I'm very dissapointed with the manager at game Galleria