You had no desire to do the job. I suspect that your interactions with the client weren't the best, but they thought they were stuck with you. When they found someone they got along with better, they cancelled.
Not in the slightest bit. My communication is sterling and always on point. It's prompt, as I check my email compulsively, well spoken, and never contains any typos. I'm well spoken and take my job seriously. Up to the cancellation there was never the slightest hitch in dialogue and it came completely out of nowhere.
As far as my desire to do the job is concerned, I'm sorry but you shouldn't really interpret 'I wasn't looking forward to doing the job' to mean 'I've no desire to perform and am going to half ass it.' Not all jobs are created equally and some you simply enjoy more than others, whether it be the nature of that specific job, the nature of the client, or simply how your schedule is looking surrounding it. As well, there are other logistics to factor in, such as how busy you are from one week to the next, how much dispensable time you have, and how many hours you're already logging that week, and how much travel is involved. Simply because my mood going into it was lukewarm doesn't mean I would have allowed that to affect my work output.
If you're trying to tell me that every job that a client has ever been performed should be fulfilled with the same level of innate mental enthusiasm, as in you aren't allowed to even have the slightest shred of motivational erosion, you're beyond delusional. We're human and some roles we enjoy more than others. To say otherwise is beyond unrealistic. Some days you're 'eh' and others you're not. It's called life.
Thanks for the benefit of the doubt, though. I'll be sure to take your above points and immediately throw them in the trash, worthless as they are.