Previous landlord wanting to take the chattels back after house purchase

I bought a house in April this year with all settlement done and dusted. The house was tenanted by students at the time of purchase and the tenancy agreement is fixed until end of December this year. I am still contemplating but likely to move into the house I purchased by early next year provided I get a new job at a workplace closer to where I bought the house. The previous landlord has got back to one of the tenants yesterday asking if they can come and remove the lounge suites (leather couches) which they bought by end of last year while they were still owning the house. It's been 6 months now and I wasn't aware they they bought the couch and wanted to take it away later. As per sale and purchase agreement under the chattels section (schedule 2) , the leather couches are not listed at all. But they are listed as part of the tenancy agreement when the students signed the fixed tenancy term at the beginning of this year. I don't want to disturb the students given this is exam time and also I don't have money to replace the couch at the moment either.

Now my question is,

1) Can I legally contest this knowing that they are not listed on the sale and purchase agreement?

2) Since it is part of tenancy agreement, even if the previous landlord wanted to remove it, the couch must remain in the house until the tenancy agreement comes to an end by end of this year? Unless all students consent to get it removed.