I Hmmmm

So I'm not wanting to show up to the job i was offered for hire today at 12 . it's a door to door salesman i am supposed to arrive at 12 to take notes . I'm not wanting to go i feel like i deserve better . i want to call and let them know i appreciate their offer but i won't be able to be coming in . idk i just don't want to seem unprofessional either . I'm kind of stuck on that today . :/ any advice ?