I am sorry to hear about the problems you are experiencing.
Please contact me off list at email@example.com and I would be
happy to discuss what kind of work you would like to have done.
If you paid to have molds made then they are yours but getting them
back from someone with the kind of work ethic you are describing is a
whole different issue.
Diplomacy should be used with every person you work with but I don’t
think just asking for your molds back requires anything more than
just asking to have them sent back to you. If you are concerned about
their reaction then it is definitely time to move on.