Share house management company charging 1000yen a day for every day rent is past due date?

Hi, so long story short life happens and I’ve not been able to pay my rent on due time, paid it this month and have been told that I need to pay them 1000yen for every day that entered the month of August until the present day, this really doesn’t sound reasonable to me and not anywhere in the contract has it mentioned such a rule or anything,
I’m Japanese but not raised in Japan so I can speak perfect Japanese, I really don’t wanna pay them if I don’t have to? I am thinking of calling the department of consumer affairs to ask them for their help but thought I might as well ask here.. Thanks!

by Loud_Rain5619

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