Dear Mr. Khurram,
I would like to thank you for your enormous help in the processing of my visa application. It was a tough and rough fight but in His fruitful time, was granted. You and your co-solicitors was the instrument of this fulfillment. Gratitude will always be mine and this will be forever be appreciated. Again, my warmest and sincerest thanks to you and your team.
Forwarding you a copy of my residence permit, for your reference.