I second the opinion of having someone else proof your resume and external communications. It may be fine, but when I was a hiring manager I was appalled at the quality of communications I would receive sometimes. Bad grammar, spelling errors.. I was shocked. It indicated sloppiness, or a lack of awareness especially if your job is going to involve working with customers. Again, yours may be perfect, but I'm trying to throw out thoughts as to why you might not be getting any responses.
I do wish you the best in achieving your aspirations.