Over two dozen residents of the Bronx building that partially collapsed in December alleged their landlord harassed them following the incident and described dire conditions in a lawsuit filed Monday. Tenants from 1915 Billingsley Terrace say they want immediate repairs done, the destroyed corner of the property rebuilt and the ability to return to their homes. “We are literally living day by day,” said Diana Vargas, 36, whose fifth-floor apartment was one of those destroyed and who has been staying in a shelter ever since with family. “It’s so hard.” She and many neighbors became emotional at…