if you have access to email ID & your cell number is used for passwd & verification process is simple
over IRIS you can click forget password and retrieve it.
once you have access to iris you can 1st modify the registration details wait for update.
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if you do not have any such data, approach the regional tax office with an application to neutralize / suspend any earlier registration which is nothing but CNIC is misused.
further you need to be sure about NON-EXISTANCE of any partnership deed or agreement to operate business under certain arrangement.