Urgent Complaint Regarding LG Sound System and Poor Service at Makro Crown Mines

I would like to formally express my dissatisfaction with the LG sound system purchased from Makro Crown Mines, as well as the poor service I received from Maria, the store manager, who failed to resolve my complaint effectively. I purchased the LG sound system two years ago. The speakers stopped working, and I returned the unit to the store. I explained to Maria, the manager, that I rarely use the sound system as I am usually alone at home and my husband is not always around. She booked the system in for repairs. The technician contacted me and asked what was wrong with the speakers. I informed him that there was no sound coming from them. I asked if he would be repairing the system properly, and he assured me that new parts would be installed. I collected the sound system at the end of May. However, when my husband attempted to watch a movie, we discovered that the speakers were still not working. I called Makro and spoke to Maria again, who informed me that the warranty had expired. She confirmed that I could either receive a refund or exchange the sound system. I requested a cash refund, as the system is rarely used and continues to malfunction.