I went to KFC to apply for a job the night before yesterday. After filling out the form, the manager told me that he would call me during the interview. I don't know if there is a gentle refusal.

KFC won't let you fill out the form unless it recruits people. Just to tell you, there is no shortage of people.

Calling a comrade is not a euphemism for refusing. If what you fill in meets their requirements, they will call you for an interview, and the interview will focus on calling all the interviewers one day, so you need to wait for a phone call.