Livpure — Harassing by sending legal notices

Hello,

I have rented RO livpure subscription & had to transfer the ownership to a flatmate. The flat was vacated due to COVID & livpure was sked to collect the RO.
However, they failed to do so for a Year & now reaching out for collection. At the moment, there is no one in the flat & the machine cannot be returned. In turn, they are sending me legal notices even though I tell them about the ownership transfer. This is a fraudulent practice & must be contained.