I have wifi connection but can't access to Internet

I have htc 620g. Im connected to wifi but i cant access to internet. there isnt any problem at my other devices (phones or laptops). I formatted my phone, factory resetted the modem, tried dns settings but couldnt solve it. Give me some advices please, thanks. (sorry for bad england)
edit:i dont have problem with mobile internet or other wifis

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