My spouse, daughter and I stayed in a rental apartment for 2 years and we recently moved out. Today I received a moving out statement from the rental company which mentions bathroom and bathtub resurfacing charges of $400. Since there were only 3 of us and we had two bathrooms, AFAIC, it was normal wear and tear (white color getting dull). There is no other damage.

I'm not sure if rental company should charge me for normal wear and tear or even if it can be classified as normal wear and tear. I need your help to understand if it's worth contesting these charges. I am attaching screenshots of bathroom and bathtub for your reference.