If sending a complaint & refund request would make you feel better - do it.
[I sent a complaint/refund request e-mail to their corporate HQ via their website]
I bet your post has helped more than 1 reader & made some make a mental note to ask about such charges before checking in @ Days Inn or any hotel.
[I hope so]
A thought - will you ever stay at the same Days Inn again? If so, remember to take the box of tissues & roll of toilet paper with you! Those should be worth about $1.

[/QUOTE]
[If I stay in that hotel again perhaps just B4 I check out I'll "accidentally" clog up the toilet!]
NOTE: My replies are in [brackets]