Can I file a case against a travel company for cancelling my trip without proper refund?

Depending on the terms you agreed to at booking, an outright cancellation by the company itself (as opposed to a cancellation you initiated) generally entitles you to a full refund, rather than a partial credit, unless there's a genuinely valid, specifically applicable reason (like a documented force majeure event) that the company can point to.

You can file a consumer complaint alleging deficiency in service and unfair trade practice, seeking the full refund along with compensation for any resulting loss or inconvenience — such as any non-refundable costs you separately incurred, like time off work or connecting travel arrangements.

Keep your booking confirmation, payment receipts, all communications with the company about the cancellation, and their specific terms and conditions handy, since these will form the basis of your complaint. Many such disputes are also resolved through the Consumer Commission's mediation process before needing a full contested hearing, which can offer a faster resolution.