Prevent Submit -Contact Form 7

i’m trying to apply something like this
I made a ajax request that’s return me a JSON.

And i need to check on submit if the value of a input exist in JSON

but preventdefault is not working

var flagErro = false;

jQuery('.wpcf7 input[type="submit"]').on('click', function (e) {
	jQuery.ajax({
        url: 'https://api.sendinblue.com/v3/contacts?limit=1000',
        headers: {
            'Accept':'application/json',
            'api-key':'API KEY HERE'
        },
        method: 'GET',
        dataType: 'json',
        success: function(data){
					jQuery.map(data.contacts,function(elem, index) {
					     var emailInput = jQuery('.wpcf7-form-control-wrap.your-email input').val();
                         var cpfInput = jQuery('.wpcf7-form-control-wrap.cpf input').val();
						 if (elem.email == emailInput || elem.attributes.CPF == cpfInput){
						     alert('E-mail ou CPF já cadastrado!');
						     flagErro = true;
						 }
					});
				}
        });
		
	if(flagErro === true){
		e.preventDefault();
	}	
});