Telkom warranty uselesss

Hi guys, i have been using telkom landline for the past 4 years. Everything has been running soomthly up until on the 25th of January 2018 when my adsl line was interrupted due to damaged cables in Ennerdale area(my router has been working perfectly all along). logged a call with telkom on the same day.Got reference number 106CRK250118....Been paying my account perfectly with no issues but with no internet at all for 2 months. My line got restored on the 10th of March. Then on that day received a call from one of the technician asking if i was available. Told him that i m not available during the week can we make time on weekend. Which he did promise to come. When he came check if everything was restored... He connected my router and finds that my adsl light on the router its not coming up. Right? then he connected his router to see if it was the adsl line or the router. We saw that it was the router to responding. He checked the router if its still under warranty to so that i can take it back to telkom direct store so they can replace it. When i get to the store (Southgate Telkom direct store) had to wait for 30mins to get assisted. They told me that they have to take it in for repair center. After two days received sms saying that my DLink router is out of warranty and beyond repair. Now not sure if it makes sense why would you have a device that has warranty and out of the sudden they cant fix it? if they cant fix it they must give me a new one... Now the Southgate Telkom direct store is refusing to give me a new router because it cant be fixed asking me to buy another one. I have spend alot of time trying to solve this... When my contract ends please dont even bother to send me another router!!!!!!!!!! why should the device have a warranty for? if its damaged and no longer working please replace my device! Job No TRJ058560