Most leases characterize late fee as a type of "rent", then provides that failure to pay any rent in a timely manner constitutes default. If your rent as similar language, your landlord is entitled to evict you for failure to pay.
If you do not think the landlord is entitled to evict you, you must file an answer to the eviction complaint and present your defense to the judge.
The above answer is a general explanation of legal rights and procedures. It does not constitute legal advice. Nor does it establish an attorney-client relationship between the individual posting the question and the attorney providing the answer.