I am applying for a very competitive grant call for PhDs and I need as minimun 3 letter out of a maximun of 4.
I have already 3 from different professors but a 4th would come very handy so I decided to ask for it to my master's thesis supervisor.
He had not replied yet. For 2 weeks approximately.
This kind of questions has been answered here but with a difference, this mail was a first approximation so I don't have any previous agreement with him.
Recently I asked to other professor at the same institution and he has not answered yet either.
I finished the master in a friendly way, is it possible that the institution has decided not to support me?. When I was doing the master thesis I moved onto a different internship because I didn't see much of future prospects at what I was doing neither any salary. Even though I got a grant from that institution to study their master.
I'm applying for these grants with a project deeply involved with what I am working now, but absolutely nothing to do to my previous "research".
Is it a good idea to send a last email or to look for another professor at such entity/another? Deadline is within next week.