Question : snytax error

Where is the snytax error on this?

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insert into tblmail(sendTo, sendBcc, [subject], Note)
				select '[email protected]', 'sd@sdf','Account Canceled',					
					 
                    case (select refund from #temp)
						when  refund > 0  then cast(@custID as varchar) + ' has been cancelled, refund amount $' + refund + ' by ' + (select displayName from tblAd where id = @adID) + '.'
						else cast(@custid as varchar) + ' has been cancelled with no refund ' + ' by ' + (select displayName from tblAd where id = @adID) + '.'
					end

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Answer : snytax error

insert into tblmail(sendTo, sendBcc, [subject], Note)
select '[email protected]', 'sd@sdf','Account Canceled',
case WHEN EXISTS (select 1 from #temp where refund > 0 )
then cast(@custID as varchar) + ' has been cancelled, refund amount $' + refund + ' by ' + (select displayName from tblAd where id = @adID) + '.'
else cast(@custid as varchar) + ' has been cancelled with no refund ' + ' by ' + (select displayName from tblAd where id = @adID) + '.'
end