Thanks for your question.
Your concern should be dealt with through the agent, that is what you are paying them for. If the property was in a poor condition upon the previous tenants vacating then the agents would have an checking-out inspection and should have arranged the appropriate cleaning works so that it was in a tenantable condition for the next tenant. The cost of these works would then have been deducted from the tenant's deposit.
You should consult with the agents on the matter, ask about the return of the deposit to the tenant and whether any appropriate deductions were made in respect of remedying the state of the property, if no such deductions were made then you should question why. Write again to them and you may consider using an emboldened "COMPLAINT" at the top of the letter and setting time limit of 7 days for them to respond.
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