Brand New Wifi Router does not work

We bought a new wifi router from Telkom Kenilworth. It worked perfectly (as expected) for two days and then the wireless stopped working.

We have spent hours on the phone with Telkom's (patient and helpful) technicians and had a technician come in and try fix to the router; with the result that there must be an issue with the router.

We took the router to the Kenilworth Telkom shop and they had a look at our router and said "it is certainly working" after 'testing it' and refused to replace our brand new but faulty router. Now we have a brand new router that doesn't work - quite a frustrating experience when one considers how much we pay for routers and wifi monthly.