We have had a new modem fitted today, it worked for about 20 mins but now has a pink light and has disconnected from all devices and is not even visible on my WiFi networks. Tried to call but was hung up on twice. 

For the past week or so my router has displayed a solid red lightI have tried all the reset advice, unplugging all the wires and pressing the reset button but nothing seems to be working.Had the router for about 5 years now so not sure if its just ol...