Poor product quality and repairs service

I am very unhappy with the service at Cash Crusaders Metlife Plaza, Port Elizabeth and very disapointed in the quality of their in house product. In September 2020 we bought my son a Dixon blue tooth speaker for his birthday. In December it simply stopped charging and would not work. Took it back to the store on the 20th December 2020 and to date we are still waiting. Upon query we were told that they are unable to repair the speaker and we would therefore be issued a credit. It is now almost 3 weeks since we were told we would receive this credit and we are still waiting. First we were told the branch/warehouse must pass the credit and their system is down. So we waited and are still waiting. How long can a companies system be down?? How does this company operate with a system that is down for long? I feel like they are giving us the run around and I am don't know why. I am fed up as my son has no benefit of what was surpose to be his gift. We need action. I want my credit.