The new landlord asks the tenant to pay for a new Empower registration that exists already

I am a tenant in Discovery Garden and my landlord registered the Empower in his name and took AED 2000 for registration.

Now he has sold the flat and not returning the Empower registration amount.

The new owner was not aware of this and when he came to know he registered the same and asked me to register as a tenant plus pay AED 2000, while the due date to register the amount is passed.

I told him I will not pay another AED 2000 until I get the same from the previous owner. Now I am stuck between the new owner and the old one.