WiFi extender not working: connects to router but no internet when you connect to extender: EX2700

I have been using the EX2700 WiFi Range extender for roughly 6 months without any problems however in the last week it has stopped working. 

It still connects to my WiFi router (all the appropriate lights are on) but when I connect to it on my laptop or mobile phone, there is no internet connection. I have followed all the troubleshooting instructions on this website and nothing has improved.

I have reset the extender, forgotten the wifi network on my laptop/phone and reconnected yet still the same result. 

I found out I am apparently not eligible for customer support after just 90 days which is absolutely ridiculous.  I should be able to call someone without paying a ridiculous cost just to receive some help.

Asking on here is pretty much a last ditch effort, nothing else has been able to help so far unfortunately, hopefully somebody here can help