I made a mistake......?

i went for a job interview, but i hated it immediatly and then the lady said i should come back in an hour for her to give me the key, but i was so in a hurry to get out of there i wasnt thinking straight that i just said ok, but i didnt wanted the job, it was through an agency by the way, i didnt showed up and i was just praying that she wasnt waiting for me because i wasnt coming anyways, i should have been honest but now i dont know what i can do to make it up with the agency again? what do you do when you make a mistake and wasnt honest?