Help with finding the right lawyer.. :( Kind of urgent..

Sorry if this isn't the right place, but I don't know a better group to ask...

So, I had an issue sending files and basically promised high res and sent very low res to some clients. Many haven't noticed yet because they haven't tried to print. I want to get in contact with the right lawyer to find my best option to protect myself and also do the right thing BEFORE I get emails/calls from these clients. I have no idea what type of lawyer I should contact or who would help. Thanks :(