My Landlord Wants Me To Sign A New Tenancy Agreement

What happens if you are renting and you receive a new lease for two years, sign it and your rental check for that month and you send it certified so that they can sign it and the check is not deposited and the lease is not returned, did not sign it in the mail, how long it takes to return it. I learned on Thursday 22.10.2020 that my manager had falsified my signature of a lease in my apartment. My son and I were in the process of moving to a new apartment. We had passed the credit and background exam, but the new apartment needed the old history of the accommodation that was faxed to them by the manager. The manager faxed paperwork to the new apartment that said I had terminated my lease, which ended in July 2021. The problem is that my son and I had never signed a lease, so how could the lease be terminated? The apartment complex in which we live was renovated by new owners in September 2019. . .