So this doesn't went through the process. I requested the sample letter from TI. It arrived.
In the mean time I had lot of things to do and I went to vacation for a week. Finally yesterday evening I filled the form, signed and sent it back.
Today a letter arrived that my order has been cancelled.
I think this happened not because of the content of my letter. The probable explanation that I sent the letter to lately and the system canceled my order before processing my letter.