Cheated by brides family for marriage

no one can file case on you and even if they file complain you can prove with evidences do not worry 

If engagement has happened and they have photographs and other proofs then they can file 498a case...It applies before marriage as well if engagement has happened...

If they file case, you have to face trial...of course no possibility of conviction..

https://www.lawyersclubindia.com/forum/Before-marriage-is-498a-is-applicable-please-help-me-75675.asp#.VEtZjiLF9ic

https://www.thehindu.com/todays-paper/tp-national/tp-newdelhi/probationary-ias-officer-booked-for-dowry-demand/article4144898.ece

Technically yes. They can file a case and cause you trouble in short term. If you really do want to call off the wedding, lodge in a criminal case for cheating and criminal intimidation. Do you have any evidence regarding this cheating ? Any bio-data which was shared ? Or a recording which proves that they were tring to black mail you. If yes nothing like it. If no, use any witnesses for the complaint. 

If you really do want to go down this path, I would recommend that having a good lawyer would be helpful. 

the above reference was discussed as their exists dowry and engagement was cancelled and here no such dowry query has told only about education