If you have invoice or delivery challan in your possession for the proof of supplying the materials to the customer, you can first issue legal demand notice demanding the amount due to you.
If there is no response or the customer is not complying with the demand made, you may file a recovery suit through a civil court besides lodging a criminal complaint with the police for the offences of cheating.
what all are the options that we can exercise to get back the money.
You may file a civil sit for recovery of money after issuing a legal demand notice to him.
can we claim interest for the delayed period?
Yes, you can claim interest too for the delayed payment
can we claim damages?
It depends on what you would like to claim damages.
can we claim rent or share in the commercial gain the party had by using the supplies?
This also depends on the agreement between you and the party
what will be the court fees and other charges? and what is the minimum time that will take for a legal solution?
all the dealings are in hyderabad region telangana state.
The court fee aspect may be enquired from a local advocate. Time taken cannot be predicted, normally i may take at least two years.