Cleartrip — Cleartrip is not giving Flexifly offer which purchased while booking ticket

Address:

DTC Bldg, Sitaram Mills Compound, N.M. Joshi Marg, Delisle Road, Lower Parel

I have booked a flight ticket through Cleartrip, for GoAir with PNR - G9UDKT for date 17-May-21. I paid an additional amount of 229 for Flexifly, by which I can change travel date twice (Screenshot attached). Now when am trying to change flight date, through cleartrip they are not considering Flexifly offer and charging regular modification fees. I am attaching all proof, which clearly indicate Cleartrip is cheating people. When I reach to GoAir, they are telling, offer given by Cleartrip so go to cleartrip for your issue. Now where should I go. Cleartrip does't have custmercare number. Initially they responsded on twitter but they have stopped responding now. Please help us and several thousands of people in India from being cheated by Cleartrip.