Poor quality router which keeps breaking

I am peeved with Vodacom. I bought a router from them a while ago. Since then, this model type router has malfunctioned and become unusable several times. Each time they issued me with new router. Initially I thought that this was good service. After approximately the 5th time of this happening (unfortunately only 3 times that I can trace back to), this wasn't good service. This is just a pain in the ass and a massive inconvenience. The 3 times that I can trace back, are the middle of last year, the beginning of this year (February 2015), and now 2 weeks ago (April 2015). This thing kept breaking, despite it being a newly issued unit each time. This made me realize that the model is ****py. Surely they should either give me my money back, or they should recommend a new model where I pay the difference in, which doesn't break all of the time. But their last response is that they want to issue me with a new model, and so the process is repeated. Talk about not valuing your customers, Vodacom. Thanks for all the inconvenience that this has caused me!