HERE IS HOW YOU CANCEL ANY PENDING DEPOSITS MANUALLY ON MERCATOX... PLEASE NOTE YOU MUST USE CHROME AND MUST BE "PROCESSING"
open chrome, mercatox
select pending TX
r-click or  cntrl r than select inspect
java box to right opens to right, select top square "inspect" select TX info box pop up
to right on bottom import the java script below (replace transaction Id with your TX Mercatox ID)
    $.post(
        '/wallet/cancel-withdraw',
            {
                _csrf: _csrf,
                   id: "[Transaction ID]"
                        }, function (data) {
                            if (data) {
                               alert("cancelling");
                            } else {
                                notify('Error');
                            }
                        }
                    );
Press enter, than cancellation will take place immediately. Hope that helps everyone, donations of btc appreciated

donation address:1Ewasf1S4gwSMUbtmMYxKq6kHsRMfFPgCV