No Internet in T mobile

Hi Community, 

Yesterday I got T mobile internet connection first time, within few hours Internet gone, only received wifi signal but internet is not working, Actually in the modem signal in WAN and INTERNET SO I followed all steps in website to solve but nothing helpful than I called customer service to solve from there also nothing worked, Than I asked appointment for technical person she said based on the appointment only I could have, it strange that she don't know when available, I don't know how many days i am going to be without internet connection, I don't feel good at this service.

Someone having experience like this?