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Your lease guarantees you peaceable use and possession of a habitable premises. If they failed to provide you a habitable premises and failed to cure the breach of their lease with you, then you are entitled to sue them for damages which includes you recovering any deposit you made or any rent you paid for their providing you a premises that was not habitable because of the infestation. If they refuse to refund your money or try to demand more money, you can file a suit in small claims court against them for the damages and recovery of your money, including your costs of having to find another place.