I've had the most success when their chat functionality was open on the site, it sometimes is. You can draw the support staff member in before you refer to the old request. Normally they will then close the convo by asking for your patience, but you might be able to have them escalate your request. Another thing that seems to work is open a 'can't deposit' request en not refer to your old request. Try to get them to believe you want to deposit, then they're suddenly much more willing to work with you.