Hi Team, 
I have one requirement says, I have to delete the duplicate account related contact records. 
Note: Keep the latest one and delete the old one.
So, I wrote the code but it is always deleting the new records and kept the older ones.
I have to delete the older ones and keep the new ones 
Please correct my code ifany mistakes I did

MY Code :
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global class deleteDuplicateRecords implements Database.Batchable<sObject>, Schedulable {
    
    global Database.QueryLocator start (Database.BatchableContext bc) { 
        String Query = 'Select Id, Name From Account';
        return Database.getQueryLocator(Query);
    }
    global void execute (Database.BatchableContext bc, List<Account> accList){  
        Set<Id> accId = new Set<Id>();
        for(Account a :accList) {
            accId.add(a.Id);
            }  
        List<Contact> con = [Select Id, Name,AccountId, Lastname  from Contact Where AccountId IN: accId];
        List<Contact> dupList = new List<Contact>();
        Set<String> orderObj = new Set<String>();
        for(Contact a: con) {
            if(orderObj.contains(a.Name)) {
dupList.add(a);
            }
            else {
                orderObj.add(a.Name);
            }
        }
        delete dupList;
        }
    global void finish (Database.BatchableContext bc) {
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage(); 
   String[] toAddresses = new String[] {'babar.sanjamala@sbdinc.com'}; 
   mail.setToAddresses(toAddresses); 
   mail.setSubject('Apex Batch Job is done');
   mail.setPlainTextBody('The batch Apex job processed successfully'); 
   Messaging.sendEmail(new Messaging.SingleEmailMessage[] {mail});
        
    }
    
    global void execute(Schedulablecontext sc) {
        deleteDuplicateRecords Acc = new deleteDuplicateRecords();
        Database.executeBatch(Acc,200);
    }

}
 
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Thanks