False dowry case filed by in laws without marriage what should I do?

Received a legal notice from advocate of supreme court of charges of dowry life threatening and mental harrasment. My engagement was done on rush. I did not like the girl on engagement day so stated the same to the girl later and then there used to be arguments. It was broken and we apologised. so it was reconsidered. I asked her to plan & book a trip after wedding she did not like and started arguing. They broke it again. I apologised alot by sending 100s of messages. she responded to saying it will need time & effort & later broke it. Later her parent asked to pay 3L which my parent refused saying we can pay only 20K. After that they sent this legal notice of 5 page saying it would be informed to my manager & my fathers seniors in the office with disciplinary action. They included my whatsapp fight argument. They blamed my parent for dowry tilak. we have not received any cash &my wedding is not done. we have not given any threatening statement.Please advise how to deal now.