Unfortunately, emergency magick is very difficult, even for experienced magicians, because of the desperation and heavy emotional attachment to the outcome that are involved. Magick generally needs at least a little bit of time in order to shift circumstances.
I think your best bet is just a simple petition, like I describe here:
However, the biggest issue is time. You left the magick until quite late, so it is extremely difficult to turn the tide of circumstances in the time frame you have.
I would make a petition to King Paimon, and ask him to sway the minds of those you owe so you can have more time to get the money you need. Then I would petition Bune to bring the money.
Make your petitions with sincerity, and full trust in the spirits.