All Muslim Brothers. Have Faith in Allah and recite this dua in you heart when free and after prayers, Allah will InshAllah give you blessings regarding your visa,
اللَّهُمَّ لا سَهْلَ إلَّا مَا جَعَلْتَهُ سَهْلاً وَ إنْتَ تَحْعَلُ الْحزْنَ إذَا شِئْتَ سَهْلاً
Allahumma la sahla illa ma ja'altu...