.Sh.Sushil Bansal Ji,
W.r.t. your above post, even then the issuance of SCN is not time barred, if the elements of mens rea are present. If all the transactions are genuine and duly accounted for in the books of account, retrospective cancellation of the registration of the supplier cannot disentitle the buyer/recipient. Regarding the invocation of the extended period, the burden of proof is cast upon the department (there are so many case laws) but regarding correct availment of ITC, the burden of proof is cast upon the assessee (buyer) under Section 155 of CGST.
In this case, investigation is in progress. We cannot expect disclosure of full facts on public forum. Otherwise also the querists hesitate to disclose full facts on the public forum. and In the absence of full facts, correct and fool-proof advice is not possible.
Right time of seeking advice on public forum is after the issuance of SCN and NOT prior to the issuance of SCN. It is not in the interest of the assessee though name is not disclosed. No need to explain in detail. Half-disclosure of facts means half-baked reply.