Section 129(6) in Punjab Goods and Services Tax Rules, 2017
(6)The Director General of Safeguards shall complete the investigation within a period of three months of receipt of reference from the Standing Committee or within such extended period not exceeding a further period of three months for reasons to be recorded in writing as allowed by the Standing Committee and, upon completion of the investigation, furnish to the Authority a report of its findings, along with the relevant records.