Indigo has changed Fuel Surcharge on one particular flight and not ready to give any information about how they calculate this Fuel Surcharge.
The only one line response I am getting is that Fuel Surcharge is airline imposed and can be updated without any notice as per agreed terms and conditions of carriage.Earlier they use to play only with fares but now they involved things like Fuel Surcharge. Below is the copy of whole correspondense. They are really unethical people. Kindly refer the correspondence (from below) to understand this case.