How to save ourself from harrasement

A lady who is 13 yers older than me we had a relationship but not sexsual yes physical touch was involved and we had a chat. i had taken the backup of whatsapp chat to my mail which is a facility provided by whatsapp and i showed her that i had backup but after i left organization and city as i got new job in new city i deleted everything and she is a head in my organization. now i left the organization and i am not in touch with that lady in last 4 months. now she tells everything to his husband and narrated story as it was my mistake and his husband is threating me to file a cyber crime molestation and sexsual harssement case against me and claiming her wife is sick and if something happens to her he will destroy my family and life. as i stopped talking to him . She took out my family details and contact numbers from her office as she is still at top position in the organisation. Now his husband is calling my family members and asking them to tell me to talk to him as its someone life issue and threatening me that he has all my family contacts . he is calling me now and then and threat is on going. Please if anyone can help me here.