$bill_opt{'return_bill'} = $return_bill[$i] = [];
$bill_opt{'pkg_list'} = $next_bill_pkgs{$next_bill};
$error = $cust_main->bill(%bill_opt);
$bill_opt{'return_bill'} = $return_bill[$i] = [];
$bill_opt{'pkg_list'} = $next_bill_pkgs{$next_bill};
$error = $cust_main->bill(%bill_opt);