Interviews are one of the most important steps towards getting a job. However, sometimes we have to decline calls for an interview for different reasons. Usually it is due to being employed after applying, finding the job to be unsuitable for you or many other issues.
The best way to decline an interview call is to email the organisation at their official email address and let them know that you will not be coming in for the interview.
Start the email by thanking the organisation for considering you as a suitable candidate and asking you to come for an interview.
In the next paragraph, let them know that you will not be able to come for the interview along with the appropriate reason. Conclude the email by showing your appreciation once again for the kindness that was shown to you.