GST query...............

Query 1:-While reading the provision for GSTR 7 there is a refund option for erroneously paid tds by the deducter, then what about GSTR 8 e commerce operator can apply for erroneously paid TCS if the supplier is not claimed such erroneously paid tax in electronic cash ledger? If yes under which head?
Query 2:- in case of GSTR 7 and GSTR 8 GST deductor and e commerce operator can adjust excess paid TDS and TCS against subsequent month TCS liability? What is the time limit pf such adjustment?