MBTA Parking Ticket

I regularly park at an MBTA lot and take the train in. I know I have missed paying for parking on my phone a few times over the last few months.

However, I have yet to receive anything in the mail (like a ticket or even a late notice). Per their website, they issue tickets or violations monthly. Does anyone know how to resolve this? Who to email to at least get them to mail me the ticket? I have no way of paying without receiving a citation number via mailed ticket.