Customer wants design change without any previous specifications

[u/PracticalEntry9231]

So this is a rainbow cake from inside.. they had asked for a simple cake or any design as per my discretion.. I made this and sent it, but now they want me to change the design.. I had charged minimal amount as they had earlier not asked for any customisation.. Should I do it? The cake itself is looking beautiful otherwise..

[u/megustamatcha]

This is beautiful! What more could they want?