From their FAQ:
"Students are strongly encouraged to adhere to the payment deadline as SIM-UOL Admin needs to confirm the classes. If you need an extension, please email to SIM Student Services at
students@sim.edu.sg using
your SIM Mymail account with supporting documents (eg. Approval bank loan letter). A re-instatement fee of $53.50 may be imposed to reinstate your status after the payment deadline."
I asked them before and this is their reply:
"You may come down to Student Services @ block B 1.28 to collect your student card.
we are open from 8.30am - 7.30pm on weekdays and 9am-1pm on saturdays."