Bad product

I bought the new twisp in July. Since then I have had to take it back four or five times. The battery keeps over heating and they had to eventually give me a while new device. They told me that they could not give me my money back buy if the device was still over heating they would. However they would then charge me usage. I have had the new device since Friday (now Sunday) and if it's over heating. Never mind all the time I had to drive back and forth to the shop and pay petrol and parking. And they say they want me to pay usage. This device cost me R800! I have suppotter twisp for so long. But after this experience I want evertone to know about the terrible service I have had recently.