try with airport immigration, (known as qatar airways visa) you fill the application, and take your passport copies along with, and first you go inside and meet the officer/captian, the visa is issued as per his mood, relly..
i got the same for my in laws last year, they are above 60, and when i met him, he issued the visa, but from the counter they rejected, and again i went and meet him , and then he again issued, and thus i got the visa, and they stayed for 1 month