Huawei Router not Connecting via WiFI. Only Connecting via the LAN Cable

I got a contract for a Sim and a Router with Vodacom. The router is now giving me issues - not connecting. Took it to Vodacom in Westgate mall Roodepoort. They couldnt assist. They instead referred me to Cresta mall or Eastgate mall where they claim that it is the repair centre. I wonder why should i be the one doing theups and downs with this device that not working. If i knew that Vodacom does not have a process in place to handle the faulty devices, i wouldn't have signed for this. The guy who claimed to be the technician at Vodacom asked me to buy the extenders. It s still not working with those extenders. I wonder why will i need the extenders now while the router has been working for the past 6 months without extenders. I need help this. I now don't see any need for having it while i cannot use it