I have done a short summer research internship at a department of a famous University in Europe. Unfortunately, this was last summer and I reminded my professor several times now to give me some sort of written confirmation that I actually stayed at his department.(3 times per E-Mail and one time, when I left him). He always said that he will do it, but he always pointed out that he is very busy currently.
Do you think this sounds true? I mean, it has been half a year now and apparently there is not much to do about it instead of just waiting or is there? I also just asked for a few lines, not a confirmation letter of anything similar and I also told him that I would need this for my home university(Which was true)- but he did not really react upon that.
I do not want to pressure him by being more "rude" in my mails, this is not the way I deal with such situation, but I think his behaviour is very annoying and I want this piece of paper now.
How would you deal with that?