I Terminated my tenancy contract due to Job loss, ...

I Terminated my tenancy contract due to Job loss, in this Covid -19 Situation i was living without job from Mar to Sept but they Charged me 1700 Extra for termination, Despite i provided a termination letter and other relevant documents, I vacated this apartment on 14-09-2020 now until 07-01-2021 they didn't refund my Security Deposit,
I am following them every next day but in vain, Now that Lady stop answering my call and not reply to my emails or messages. Now i am living in another city so its hard for me to go to their office. Can anyone suggest me any Solution?
Rubbish customer service