if there sponsor is not reponding to him then he should not lost his hope he should know that everybody have a different mentality he can go to a2a friends and ask some people that can speak the same launguage that he can understand and ask them or go to frequent ask question because he did not know why the sponsor did not reponding to him or her .may be he or she can not speak the same lauunguage with him or her .or he is sick something like that can happen
i hope this answer help