If Ms. C gets a chance to lodge a Complaint in Court so which is right place to file a case first for getting the relief?

The correct answer is District Commission / District Forum.

Under the Consumer Protection Act, a three-tier quasi-judicial machinery has been established at the district, state, and national levels to resolve consumer disputes efficiently. The jurisdiction of these forums is primarily determined by the pecuniary value (the monetary amount involved) of the claim or complaint.
As a rule of consumer law, a complaint must be filed in the lowest court or forum that has the jurisdiction to hear it. The District Commission (historically known as the District Consumer Disputes Redressal Forum) is the court of first instance for consumer complaints falling within its monetary limit.
Since the District Commission is the lowest tier in this consumer dispute redressal hierarchy, it is the right place to file a case first for obtaining relief, before appealing to higher bodies like the State Commission or the National Commission if needed.