Indian Oil Corporation [IOC] — request for change in mobile number

Address:Saligramam, Chennai-83, 600083

My consumer number is 6767 in nanda gas agency, chennai. I have forgotten the mobile number against which my consumer number is linked. Can you please help me in changing my mobile number currently?
I tried speaking to the executive at nanda gas agency who is helpless and clueless about this.
Please resolve for us to book cylinders online.
We are unable to book cylinders online currently.
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    Indian Oil Corporation [IOC] Phone
    +91 99 1155 4411
    +91 98 4882 4365
    +91 81 2402 4365
    Indian Oil Corporation [IOC] Address
    SCOPE Complex, Core-2 7, Institutional Area, Lodhi Road, New Delhi, Delhi, India - 110003
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