Sh. Ganeshan ji,
It's admitted fact that the assesse can claim refund of funds lying in E-Cash Ledger anytime from the department as the money belongs to assessee. Govt stands to benefit only when the debit entry is made and furthermore Govt considers revenue realised as Revenue Collection.
Board has clarified this aspect in Circular No. 7/7/2017-GST dated 01.09.2017 (Para 11 & 12) issued for System based Reco of GSTR-3B
Submission of GSTR-3B without payment of taxes:
11. Where, for some reasons, the registered person has only submitted the return in FORM GSTR-3B and has not made the payment of taxes by debiting the same from his electronic cash or credit ledger, the return shall still be subjected to the reconciliation process as detailed above. Such registered person should furnish the details in FORM GSTR-1, Page 4 of 4 FORM GSTR-2 and sign and submit the return in FORM GSTR-3 along with the payment of the due taxes as per the provisions of section 49 of the Act.
However, since the payment was not made on or before the due date, the registered person shall be liable for payment of interest on delayed payment of tax starting from 26th day of August, 2017 till the date of debit in the electronic cash and / or credit ledger but will not be liable to pay any late fee provided the requisite return in FORM GSTR-3B was submitted on or before the due date.
Even in earlier law, if amount is deposited in PLA, until the same is debited, it's assessee money and not Government funds.