You should file a civil suit for the recovery of losses you have incurred in the ring ceremony. When the contract has been breached the responsible party has to compensate the other to the extent of loss he suffered due to breach of agreement.
This is pure civil wrong thus you can move a civil suit irrespective of the religion. Engagement is an agreement of marriage therefore, it has a legal validity and upon breach of the engagement you can claim damages.
The fiance’s family is responsible for the breach of agreement hence, he shall compensate you. You have to produce the list of expenses along with the plaint. You are entitled to claim compensation if engagement is broken for inappropriate reasons.
In this situation you can also seek compensation for the mental agony, social humiliation, loss of reputation etc. No need to send a legal notice to them before filing the civil suit.