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The landlord is in breach of the lease and you are entitled to demand payment to stay elsewhere or reduction in rent for the premises not being habitable. If the landlord is not making repairs and is wanting you to release yourself from the lease, this is also a constructive illegal eviction, since they seem to be purposely not making repairs to force you to leave. The landlord is liable to you for damages here, which would be all costs of moving and for damages you incurred and I would not suggest mediation based on his conduct, I would suggest a lawsuit and also suing for not just breach of lease, but unlawful constructive eviction and seeking punitive damages for their intentional and malicious conduct in refusing to make repairs in a reasonable time and then trying to get you to move.
I would suggest that you go to the local legal aid office if you cannot afford an attorney and get their assistance to sue this slum lord company for damages that they caused you to incur.