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Script:

 //Previne múltiplos cliques no Contato
    jQuery(document).on('click', '.wpcf7-submit', function(e){
	     if( jQuery('.ajax-loader').hasClass('is-active') ) {
	          e.preventDefault();
	          return false;
	     }
	});
	
OU

 //Previne múltiplos cliques no Contato
    jQuery(document).on('click', '.wpcf7-submit', function(e){
      if( jQuery('.ajax-loader').css('visibility') == 'visible' ) {
        e.preventDefault();
        return false;
      }
    });
	
	
SCSS:

.ajax-loader {
	width: 100% !important;
	height: 100% !important;
	position: fixed;
	left: 0;
	top: 0;
	background-repeat: no-repeat;
	background-color: rgba(255,255,255,0.8);
	z-index: 999;
	background-position: center center;
	background-size: 10%;
	background-image: none !important;

	&:before {
		content: "\f110";
		font: normal normal normal 50px/1 FontAwesome;
		background-position: center center;
		position: fixed;
		text-align: center;
		display: block;
		top: 40%;
		left: 50%;
		animation: fa-spin 1s infinite steps(8);
	}
}

.wpcf7-form .wpcf7-response-output {
	font-size: 13px;
}
.wpcf7-form .wpcf7-response-output.wpcf7-validation-errors {
    color: #D8000C;
    background-color: #FFBABA;
    border: 0;
    padding: 10px;
}
.wpcf7-form .wpcf7-response-output.wpcf7-mail-sent-ok {
    color: #4F8A10;
    background-color: #DFF2BF;
    border: 0;
    padding: 10px;
}
div.wpcf7-mail-sent-ok:before,div.wpcf7-validation-errors:before {
    font: 26px/30px FontAwesome;
    margin-right: 16px;
    vertical-align: middle;
}
div.wpcf7-mail-sent-ok:before {
    content:'\f00c';
}
div.wpcf7-validation-errors:before {
    content:'\f057';
}