disappeared dialed call log in S5

[AC Question]

Experts, please help!! I had a minor car accident the other day and I got the other party's driver phone no. for future claims. I called her on the spot with my S5 and it went thru. Without answering we both hung up. Hours later when I tried to call her I noticed there was no such call log...and I didn't save her no. right at the spot. Please help!! Thanks!