Can a landlord double bill for an apartment?

[SJ Eplett]

I paid for my rental apartment through the month, but moved mid month. 

The landlord said I was responsible for the whole month.  But but moved a new tenant in mid month, directly after I moved out.

Should I have been prorated for that month? Or should I just leave this alone? 

Does anyone know if there are landlord guidelines about this situation?

[Deanna McCormick]

The landlord may have given new tenant possession mid month and may have not charged for that portion of the month to that tenant.. 

Double rent is not an option, he can not charge new tenant rent for the remainder of the month, but he can permit new tenant to move in early at no charge.. So ask your landlord in writing for portion of the rent from date new tenant moved in as an additional refund.. See what his response is 

You can look up the landlord tenant laws for your state and include that within your request as verification of what your asking for.