Go through your Paypal records, send the refund, and walk away. Unless they paid you a large sum of money, very little is worth a 20 page comic. You are allowed to refund a commission at any time, without any reason.
If they never paid you extra for these "bigger, more features", then they have no leg to stand on to keep demanding more and more from you. It seems like they figured they could push you around, and nothing is worth that.
They do not get their original item + a 20 page comic. No. Put a stop to this immediately. They can try to report you here, but I doubt any member here would take a client who came in and said "I wanted them to do this this and then THIS all for the original price I paid!!" seriously.
no subject
If they never paid you extra for these "bigger, more features", then they have no leg to stand on to keep demanding more and more from you. It seems like they figured they could push you around, and nothing is worth that.
They do not get their original item + a 20 page comic. No. Put a stop to this immediately. They can try to report you here, but I doubt any member here would take a client who came in and said "I wanted them to do this this and then THIS all for the original price I paid!!" seriously.