If you can't do the work, just say so.
I contacted Zion, of Bin Solutions, in July about adding a shelf to a storage shed he had built for me previously. He responded that he could install the shelf MAYBE NEXT WEEK. As weeks passed and no work was attempted, Zion kept suggesting "NEXT WEEK."
Finally, at the end of August, Zion suggested he MIGHT get to my job "before the winter."
Dishonest or disorganized? Either way, Zion from Bin Solutions disappointed.