International roaming / India - has issues

I have international  roaming available as part of plan,  but  phone won't  connect to  internet.  I am currently  in a city  called  Coimbatore,  Tamil Nadu,  India.   The  phone connects to  a  strong  signal  from  Vodafone - India  (and  shows all bars  are up on signal anywhere in  city).   

But,  when i try to  start up chrome  browser,  it  immediately  shows  "NO  INTERNET".   Has  been consistently  doing it  for past  few  days  that  i have been here.  The  obvious  checks  (Mobile data,  Data  roaming,  Network  operator etc)  have all been  checked.  So,  i am starting to  think  that  vodafone  india  is  throttling  or  cheating  Tmobile  on  their  end of the  deal.

If  not,  how can  tmobile  give  me  data  service  here ?  I need to get this working soon, since i  will be  india  for a while…..currently,  i am getting  by  only  on  wifi connects.