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Welcome to JA.
I am sorry to hear about your situation.
From the circumstance described it appears the agency's conduct prior to you moving in could be deemed a misleading action which likely influenced you to sign the tenancy agreement. Misleading action as described can be deemed an unfair trading practices, which is prohibited by the Consumer Protection (Amendment) Regulations 2014.
The law states that where someone has entered into a contract as a result of a misleading action or aggressive practice, redress under this civil law may be obtained through the right to unwind the contract, a discount and/or damages.
Do you understand what i have stated so far? if yes i will proceed to the next steps
In order to claim this right, you must inform the landlord (or landlord's agent) that you want to reject the contract within 90 days of the tenancy start date. There is no obligation for this to be put in writing, but I strongly advise you to do so.
Therefore please take pictures, make the list of damages as you suggested and then please write to the Landlord/Agent reminding them of your rights under the civil law in question and you wish to exercise the right to unwind the contract.
Assuming they do not accept your position, you can file a complaint via the property ombudsman or the local council.
Yes sure the law which prohibited this conduct is the Consumer Protection (Amendment) Regulations 2014
You can do so. Before you do please accept the offer proposed to undertake the service requested.