Oh my dear, don't you remember I advised you to type the letter? Hopefully you know their full address and have a car. Drive everything over to them tomorrow with a written letter and hang it on their doorknob! Be done with it and be sure. Keep a copy of the letter for your records. I know I'm old school and everybody does things electronically these days. But sometimes paper is best. You don't need to stress over it, make it a sure thing.