What are your symptoms that an Orisha is attacking you? If someone just told you this then I would say they’re being lazy and hoping your fear will do the work for them. If you have divined this for yourself that’s a different issue.
What have you done so far to banish and cleanse yourself?
Here is a tutorial for the Lesser Banishing Ritual of the Pentagram you can try.
If you want you can post a request for free work in the Requests thread below, but this forum is about us learning to do our own magick so outside of that thread we’re going to try to help you do it yourself.