Change the term based on the value of a $variable using wp_update_post in submitting a form

Your problem is this line:

if (isset($_POST['call_16']) == 'No' ) {

isset() returns true or false based on whether the 'call_16' item exists in the $_POST array. It doesn’t return the value. So isset($_POST['call_16']) is true, not 'No'. If you want to check if it’s set and that it has a specific value (which you should), then you need to check them separately:

if (isset( $_POST['call_16'] ) && 'No' === $_POST['call_16'] ) {

Although, it should be said that you’ve already used $_POST['call_16'] earlier, so the check for whether or not it’s needs to happen earlier, and then just check the value for this specific condition.

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