Is it permissible to take the money that the landlord returned after terminating the lease due to a dispute?

An ijara (leasing) contract is a binding contract, and neither party may unilaterally terminate it except with the consent of the other party or for a legitimate Sharia-compliant excuse. Accordingly, the lessor is not obliged to refund the rent if the lessee vacates the property before the end of the lease term. Rather, the lessee must pay the full rent because the contract is binding.