How can I protect myself from false misconduct and defamation allegations?

I was employed with a company from November 2023 to May 2024 as a full-time employee and later worked as a freelancer. Despite assurances, salary delays were persistent and paid in installments. After repeated follow-ups and missed payment deadlines, I visited the office to discuss the pending dues. During the visit, I remained professional but spoke firmly out of frustration due to the delays and lack of response from my employer. Now, the employer is alleging misconduct, workplace disturbance, reputational damage, harassment claims from my office visit, defamation for raising my voice, unprofessional conduct for contacting the MD’s wife (CEO) when my calls were unanswered, and accusations of violent or threatening behavior. I need advice on how to safeguard myself from these allegations and resolve the matter amicably once the payment is cleared. Thank you for your assistance.