Fear of stealing my work

[fabian_sl]

I currently had a order canceled out of strange reasons and I fear, that the "buyer" wants to use my work further without me getting paid/ credited. What can I do? And can I use the work, which got canceled for myself? 

[ahmwritingco]

Just now, fabian_sl said:

And can I use the work, which got canceled for myself? 

You can. If the order was cancelled, then the work belongs to you.

[sultanseo]

My fear of having my work stolen.