PSD files are not given out until the client has paid in full, if the client has requested these. If you are constantly changing the graphics, then only the final product will be of use, unless it was the clients intention to use them regardless of any changes that were made.
Changes are always a given and any graphics given to the clients, will have a watermark on them, you own the copyrights on these until sold, and if they are not paid for you retain the right to sell them (minus of course the content used in the creations, if belonging to the client). The client can not use these if he has not paid for the design, as you hold the copyright and creation date on these, thus proven they were designed by you or your company.
If the client has not paid and are not actively seeking to keep the lines of communication open, you should potentially contact their hosting service to have those graphics withdrawn from the sites. Naming and shaming the client will result in them bringing their version to the table and also serve as a potential warning to others.
Seek legal advice if you wish to take this further.
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