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Was the least amended to reflect that you can live in one week earlier?Are you losing money because of the one-week delay?
Generally you would have to take it as this is a binding contract and if you don't adhere to it you can be sued.
But in this case after the lease was signed you and the landlord entered into a binding agreement as well. It doesn't matter that it was verbal. The landlord has now breached your tenancy agreement and in my view you can consider the lease at an end.
I also agree that you now see that your landlord is dishonest.
I suggest that you retain a lawyer to send the landlord a letter setting out the facts, stating that you will not be moving in as the landlord breached the agreement, demanding you deposit back and threatening a lawsuit if it is not refunded and also stating that if you end up in court you will sue for damages as well as you have lost time and money because of the breach of the agreement.