Mamela Estate or Mamela Properties Refusing with Deposit

Mamela Estates or Mamela Properties has been refusing with my rental deposit since January 2024. My offense with them is that I did not e-mail my notice to vacate the rented apartment - I wrote a letter that was given to their employee. The employee subsequently left their employment, before processing my exit. The company and owner of the apartment did not suffer any loss as the apartment was occupied from the day I left. I also reached out to the principal / Owner and he does not respond to my e-mails. All efforts to come to agreement have failed.