Ask a landlord-tenant lawyer and get answers ASAP
No basis to pursue a claim for payment made. If landlord wrongly files in court, you may seek to have it dismissed and seek legal fees.
If you have proof of the payment, send a copy of the check along with a letter warning landlord that filing a baseless lawsuit will lead to a counterclaim for abuse of process and malicious prosecution plus award of additional damages and legal fees.
Is that clear?
You can provide an affidavit to support it if needed. The passage of so much time without demand also supports your position as a court would find it hard to believe landlord never sent a demand for rent owing for 15 months.
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thank you in advance.