Provided, you have NOT collected the keys, and that you have evidence in writing that your application has been refused  they  will release you from the tenancy and refund the deposit. If the Tenancy has already commenced, and you have NOT collected your keys, you will be charged for the period from the Tenancy Start Date to the date you provide them with evidence that you have not been granted a VISA If you have moved into the accommodation prior to your Visa application being declined you will be responsible for the rent until  they  can find a student to rent your room.