that TP link router could be connected wıth LAN cable to make ıt work? I mean so other WıFı enabled devices can connect if LAN is attached to it? If yes then download connectify on Windows
http://www.connectify.me/
Get a LAN cable, plug it in your PC, enable wired router on connectify and plug other end to WiFi router. Try connecting with TP link wifi and see if it works. It should I think so.
If this doesn't works or you cant have LAN cable, google about reverse tethering (if thats android device).
P.S: I use PTCL too.