[Skunkworks] Lan is fine but Wan is not working.

Hi skunks I need your help!! I currently use my neighbor's zuku internet. A cable runs from his router to our router which is a  TP-LINK WR70N2. Recently the Wi-Fi from my router has not been working the internet connection has been limited but when I plug in the cable directly to my PC the internet is fine. I've tried a lot of solutions from online but nothing seems to work. Please wise skunks I desperately need your help.