Had my blood drawn yesterday. Waited 40 min for it...

Had my blood drawn yesterday. Waited 40 min for it. Then they call today to say they are sorry, but because my blood was not processed correctly I needed to come back. When I asked for details I was told after drawing my blood the tech got busy and left my blood sitting so it could not be processed. They said they were sorry and when it was convient for me they needed me to come back. Really since when is getting stuck in the arm ever convient? I am so upset over their poor patient care and their lack of remorse for their screw up. May not seem much to them, but to a person who doesn't like needles and isn't feeling well it is!