Thanks. As you may well know you are liable for rent until the end of the period. The fact that the property is not what you expected is not down to the landlord.
You inspected and could have done again, prior to signing without a tenant. But you have a legally binding contract
You can move out and get another tenant. I am surprised that the landlord is acting like this. The landlord could re market the property and just re charged you those additional fees.
You would be liable for the empty period and any additional costs.
By refusing the landlord is failing to mitigate their loss. They should do all they can to help you. But also you should try and find a tenant. The landlord will have to consent but that consent can’t be unreasonably withheld.
So the landlord is being unreasonable. Write and say they need to mitigate their loss and remarket. If they refuse then once you move out you can refuse to pay the rent.
Can I clarify anything for you about this today, please?
If not, I would appreciate a 5-star rating for my answer. If you need anything further I am available for a follow up at no extra cost.