how to change mobile number and Email ID

How can I change authorised signatory mobile number and E-mail id with the same taxpayer's details.. As I am doing so but same pan can't be used twice...So if I Delete old one then it doesn't allow to delete old one Authorised Signatory which is sane person only mobile number n I'd is changed...
Replies (4)
Change same in authorused signatory details.Same will be updated.
hi, now the application for amendment of core fields is enabled on GST portal .

there u can change the details in contact head.
Is Residential complex builder avail any input tax credit or not?
Builder get ITC for gst charged by sub contactor only.

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