No, there's no other plan besides pay-per-use or unlimited. The executive office won't be able to help you, as there are no other plans available. If you have data on your phone, you might be able to find an app which can send "text-like" messages over the cellular network or wifi. iPhones can send iMessages to other iOS users.
Are you asking me or the original poster? I honestly don't know what minute plan I have...maybe 900 minutes? I had a family plan with my father until he passed away...I just haven't bothered to lower the plan. And I don't pay for extended nights & weekends, as I never get close to burning all my minutes or rollover minutes.