Poor customer service from Pep cell

I have purchased a cellphone and a game to play for my four years old boy on the 21/12/2021 , but started using the device on the 18/01/2022 at first it was operating well , but the very same day it was not showing any pictures , I thought the battery was flat but it was not the case because even if I try to apply what the manual say to reset the game do not reset it only play songs . I went to Pep cell at Louis trichardt(Pep cell next to GAME Shop) where I have purchased the device . before leaving my home I looked for the slip I could not find it , But I went to the the Pep cell today on the 20/01/2022 request if I could get help from them to get replacement ,repair or refund . But the cashier said she do not even know how to operate the game ,but refused to assist me because I do not have a Slip , I asked if they are able to check their backup systems to find a slip , She said Pep cell do not have any information after they have purchased their products . It was for the first time hearing that and the cashier had someone in the office who never bother to come and assist me , the cashier said that the manager of Pep cell either can not help me because I do not have a Slip , Pep cell do not have any back up systems . I did not want to waist my time since I could not be helped by the Manager Whom I trusted that She can be of help to me .Now I pleading to be assisted either to get a refund , repair or replacement from pep cell .