From a purely law perspective,
If one of the rules in a rental agreement is violated and the agreement doesn't specify what happens in such a case, legally speaking, what is the landlord allowed to do?
Just to give you an example, let's say, in the contract the tenant was supposed to pay the rent on the 1st of each month, the s/he paid (the transaction) it on the 2nd, and there is nothing on the agreement that says what to do in such a case. What can the landlord do?