Should i write a letter to the girl father who rejected the marriage proposal?

Hi , I recently had a arrange marriage discussion with the girl family. After which they informed the girl has no objection to move forward with this proposal. Few days later my father requested for girl number so that my sister can have a video call with her. I was not aware of this. The girl father one day shared the phone number and when it was informed to me, I told that a online handle like gmail should be sufficient for now, instead of a phone number which is too personal detail of someone. Please request the same to the girl father and inform here to delete the phone number from the watsapp and arrange a call between here daughter and our sister. They will talk and exchange the details. After 2 days we listened that they have decide to not move forward with this proposal. Should I be writing a letter to girl father and the girl herself ? stating the intent behind asking to keep the phone number was solely to respect the girl privacy till an official engagement is done .