I want a refund

Vodacom Business doesn't care about its customers. I bought a Kwikka machine for my business in Middelburg Mall, I used it and all was well, until I put my business on hold to do other things. When my business was up and running again the machine stopped working and I when I called they told me that the Vodacom Sim card hasn't been in use for a long period of time and it had to be changed. They didn't want me to buy a new Vodacom Sim card, they insisted that it will be collected and returned a week after, this was in July. Now I've been calling Vodacom and every consultant say they'll get back to me and they never do, I Last called Vodacom on Wednesday and I'm still waiting for a call back from them. At this point I just want a refund so that I'll buy a new machine elsewhere.