Blue Dart Express — regarding extra money paid by mistake

Address:

Pune, Maharashtra, 411014

Today while receiving my ajio order no fl37324824 mistakenly paid 500 extra as the amount was huge. One note was attached to another. After returning back i realized of my 500 missing. I contacted courier person but he is not agreeing to return it. His contact no was [protected].

I even tried contacting blue dart customer care no but there wasn't any option of my complaint selection and customer service didn't tried to help. I don't know how to get my money back. Blue dart is well known courier brand hope they will take initiative otherwise will loose trust in their service.