Pathetic customer service

I ordered a smart wristband heart rate monitor from Makro online on the 26th of June with the expected delivery date on the 3rd of July. I was called by the supplier of the wristband on the 27th of June to inform me that the item was out of stock and I would have to wait another week to take delivery of the unit. Upon receipt of the wristband, I discovered that the unit did not work. It does not charge and does not turn on. I then called makro customer care and explained the situation. I was then instructed to make a return request online so that they could arrange for pick up of the malfunctioning wristband. I have called them numerous times as I did not receive any correspondence from makro customer care since my first complaint in the first week of July. The "customer service" that I'm receiving is absolutely pathetic. I keep getting the infamous "run around" and nobody is interested in assisting me with this matter.