Several years back, I volunteered to produce some event materials for the local Boy Scouts district free of charge because I had a personal connection with them.
Their headquarters was in a local shopping mall, who were a long-time client of mine. After I made the Boy Scout materials, the new mall administration contacted me about producing posters to promote an upcoming holiday event. I agreed, and produced some proofs that I sent them for approval. They didn't respond.
I followed up several times but while they responded they never actually gave me feedback. With the deadline fast approaching I took it upon myself to produce ten large posters for their kiosk displays. I delivered these to the mall office, only to have them tell me the manager and PR person were out of the office for meetings. I left the posters behind and went on my merry way.
Client: What are these?
Me: You asked me to produce these. I was waiting for feedback but you never sent any, and with the deadline arriving I finished the job.
Client: I never looked at your proofs. But you also left a bill?
Client: We thought you would do this for free!
They had spoken to the Boy Scouts district official, who had told them I did the Scout event posters for free...they fully expected that I would do their holiday posters at no charge! Needless to say, I did no further work for the mall, and had some harsh conversations with the Boy Scout district volunteers!