Dear Krishna Murthy Ji,
Yes, It is a valid ground. Regarding non-application of mind by the officers of the department go through the following :-
You are not aware of the internal mechanism of the department and the powers of CAG. AG (Audit) is a wing of CAG. AG (Audit) has been empowered to conduct audit of all the units ( on selective basis also), in addition to the internal audit being conducted by the department. This wing also conduct audit of all Range Offices and different branches of the department. AG office also keeps check on pendency position in the office. In case any short levy/non-levy is detected by AG Office in respect of any unit and confirmed by way of adjudication/Appellate Authorities, charge sheet is issued to the erring officer posted in Range and Internal Audit wing of the department.
Thus AG (Audit) has supervisory powers over Central Excise, Customs, Service Tax and CGST/SGST Offices.