This looks very like the bank coming in and using shock therapy to get you out of the house quick before you start thinking about your rights.
I would immediately inform them in writing that you intend to contest the eviction and are getting in touch with the PTRB to lodge a formal objection. I would expect them to reply again with some aggressive behaviour but stand your ground and let them know you have the right to appeal the eviction. I bet they soften their stance and then negotiations can begin on hown long you need to find another place to live.
If they have issued eviction notice in a dubious manner (the agent) dispute their false claim.
You could also request in writing documentation to prove the veracity of their notice otherwise you will regard it as spurious even fraudulent, if they then proceed to move any further you could claim that any further notices (trying to correction their mistake get you on a little clause elsewhere) you may threaten to proceed with defamation too (not 100% on this put if they where to move to an agency to get you out this might have sway). Also Make it conditional.
Remember you are dealing with only the LL/agent not the Bank. Forget them other than the evidence/events. You can also refuse to deal with their agent since you believe they have committed an illegal act or some transgression. State that. They'll have to prove otherwise. Act only with honour and integrity as you have always done in the past, paying rent and you clean compliance with the contract to date.... they will also have to prove otherwise if they wise to dispute this).
You could also counter claim if this causes you grief. You can also indicate that as a valid course of action.
So to summarise.
Dispute. The notice.
Claim. Bank is repossessing and trying to enjoy benefit of LL contract (which I think may be illegal) - they will have to refute this claim. If it is true they can not.
Present. Evidence of Agents & Surveyors comments and reactions. To back up the above and also will need to be disprove if they wish to go further.
Give them 5/7 working days to address.
Send as registered letter.
It's a game of Ping Pong now at this stage. Documenting everything claim and dispute using the facts as they seems to be good enough to warrant no invention unlike the agents tactics.
Like the user above says. SHOCK tactics. Ignore. Deal with it in a calm manner.