I am an international student and about a week ago emailed my top-choice PI about the current status of my PhD application (top-50 university in USA). He said, that he is going to offer me a position with full funding via "graduate student researcher" assistantship.
Next day I have received a letter of acceptance. The email says "we are unable to guarantee you financial support at this time", blah - blah, please contact your department. I have contacted dept and PI, they say everything is OK, my program offers funding for everyone, I will get stipend and GSRship with full funding. Ok, I have accepted this offer officially.
But until now they refuse to tell me my exact salary and now i do not have any financial certificate, I do not know my GSR appointment, I do not know anything. I asked them to give me any financial document because I need one to apply for my visa, but instead they tell "you will get about 1,5-2k$ stipend, everything will be ok".
Ok, now I have to apply for I-20 and I can not do this because I do not have financial certificate for my first year in the program. The grad coordinator does not answer my email.
So, is it normal? What should I do? I am just waiting like an idiot because I even can't find housing (because I do not know anything about my funding)? I have rejected another offer (with official TA contract, which was attached to the acceptance letter). As I believe, they can just tell me something like "oops, we don't have funding offer for you" and I will search for another job outside academia.