Dear Sheetal,
It would be in your interest if you write the draft and post it here. There are scores of senior members who will correct the draft. While writing, include details of the incorrect call handling: when it happened, where it happened, what the consequences were, etc.
If you do not write at all and rely on seniors, you will never learn drafting. Is this acceptable to you?
Secondly, we use the word "candidate" in reference to a person who applies for a job, and we conduct tests to assess their suitability. If the person has already joined and is working for your company, then he/she is to be referred to as an "employee" and not as a "candidate."
Ok...
Regards,
Dinesh V Divekar