How can I use Applescript or any other utility to send a daily text message to my bank?
I found an answer to this via google. This Applescript will send the iMessage:

tell application "Messages"
          send "Text of Message" to buddy "+61mobilenumber" of service "E:*icloud email address*"
end tell


I saved that as an app, then set a recurring iCal event that will open the app at the time I set every day. Voila! Beautiful.