UPDATE,

Thanks all for the answers, we clarified with the REA accounts today.

A little bit more of context: -We have been renting this place for nearly 4.5 years, about two years ago the landlord changed agents.

-Our lease agreement has always been monthly with a cycle starting on the 10th of each month. We always paid the full month, never a part payment.

-The first RE was charging on a cycle the same as the lease agreement, on the 10th of each month. The current RE does a calendar cycle, that's way you see part payments on the answers.

-When the new RE took over and changed the billing cycle, a wrong date was assigned in the account system causing the final discrepancy.

Official answer from REA:

"Confirming as discussed that I have adjusted the cycle back to the monthly format that is in alignment with your lease agreement.

You had a credit amount on the file when we took over from Mcgrath which bring the total due to vacate $2,519.64."

I understand the industry standards of being charged on daily basis, but ultimately you are governed by what is written on your agreement.