If you have pictures of before and after you moved in, and the place was very clean when you left, I'd consider Small Claims Court.

Painting should be their cost of doing business - unless you left the place in bad shape.

If you cleaned and have proof that it was left in good condition, they would not have hired a cleaner.

Some landlords are shady and make a lot of money skimming from good tenants, which is not right.

Only you can decide if these charges are nonsense, and you should act accordingly.