Thanks for your reply.

The email I got this afternoon says "Please be advised that (Agent A) are no longer Managing Agents for the above premises. (Agent B) have been appointed as the new Managing Agent by the owner.

Please do not pay any more rent to our office. All future payments should be forwarded to (Agent B) by payment method as they will advise you. "

We're not actually in a lease period at the moment - it expired in November - and I'm really confused by it all.