The letter received by you has been issued after getting permission from the competent authority i.e. duly authorised by the Commissioner. It is a practice that permission is obtained in the file. No need to be mentioned in the letter issued for audit. It is advance intimation to the assessee.
Section 174 is a saving Section and sub-section 2(e) of 174 does not bar the department. The repeal and amendment will not
(e) affect any investigation, inquiry, verification (including scrutiny and audit), assessment proceedings, adjudication and any other legal proceedings or recovery of arrears or remedy in respect of any such duty, tax, surcharge, penalty, fine, interest, right, privilege, obligation, liability, forfeiture or punishment, as aforesaid, and any such investigation, inquiry, verification (including scrutiny and audit), assessment proceedings, adjudication and other legal proceedings or recovery of arrears or remedy may be instituted, continued or enforced, and any such tax, surcharge, penalty, fine, interest, forfeiture or punishment may be levied or imposed as if these Acts had not been so amended or repealed.