Fool! As I have said to you long ago when you imprisoned me, I do not return funds paid for my commissioned lithographic prints. Had you ventured out to the forbidden crypt which houses my remains, you would have seen my artist policy scrawled in the blood of the damned detailing these facts! You simply must wait for me to be finished with your piece, it shall only take a couple of millenniums more or so. Furthermore, the powdered puffs of cheese were left in a workplace common area, how was I to have known they belonged to your person? Clearly, the fault remains with you -and you alone- that I consumed them, for your name was not imprinted on the packaging.
But it is too late for that. Now, that I have returned, it is time for my plan to come to fruition!