Question about number porting

When I activated our company account, I was assigned a toll free number from RingCentral.  I need to port over our current local number to our account and I want to replace the toll free number provided by RingCentral with the ported number, but I have no option to select that toll free number in the “Assign to” dropdown in the number porting menu.  Will I have to submit a support ticket and wait for a response?  I have tried calling support but after 30 mins in the call que, I hung up.