赞比亚采购需求：交通信号灯、信号灯、警示灯、太阳能交通信号灯、交通信号灯系统、移动交通信号灯

I'm reaching out regarding an issue with the black power bank I've purchased. It includes three bulbs, a radio, and a torch, but unfortunately, two of the bulbs are not functioning. I've previously raised this issue but haven't received a satisfactory response yet. I'd appreciate your prompt assistance in resolving this matter. Could you please provide guidance on how to fix the bulbs or consider a replacement? I really need this product to work properly, and your cooperation would mean a lot. Looking forward to hearing back from you soon!