Bond with bank guarantee

Dear Al Please suggest to me, am submit bond with BG for Rs.5.45 lac (estimated zero rated turnover 2 crores) and its running bond only hence my turnover crossed 4 crores in last Financial year. and now current pending only 9 lac on that zero pending but my BG already got expired hence we asked return back BG from GST department but they are asking payment status of all bills.   kindly let me know , its mandatory  that we need return back BG from GST because its already expired and now we are obtaining LUT. what GST will claim if pending amount on zero rated supplies if we want back BG.   Thanks.