Indane — Unable to login

Website:

access.ex.indianoil.in/oam/server/auth_cred_submit

I am unable to login for booking my cylinder on the IOCL Website/App. I had changed my mobile number, and currently I receive text messages regarding my booking on the new number. But when I changed my handset and tried logging in in the App/Website, it is showing as wrong useId/password. I tried resetting the password but the otp is being sent on the previous mobile number to which I do not have any access. Distributor is of no help. and I cant access customer care without logging in. Such a stupid thing!!!