I bought SIM card oh T mobile and activated my SIM card by T-Mobile authorised shop. With my Indian passport. And I got credit ( Guthaben) . Now I am trying get prepaid plan M through T Mobile App. Unfortunately I can’t not make it due to identification. My Indian passport is not acceptable because there is only EU passport are acceptable. 

my question 

Every telecommunication companies accept Indian as identification documents , why T mobile is not accept. I contacted customer service and asked them but no answer. I like to write to grievance department of T- Mobile Germany.. How can I get email address of grievance department of T- Mobile Germany. please. 

Thanks in advance 

Nesh