I believe you can exchange it at RBI
Go to them with proper proof of withdrawl of your 50k. It's your money in the end and 50k is a good amount- hell any amount needs to be changed.
Many people have forgot their money or found it stashed away.
give it a try
bro .. I made a contact with them, even told them that i've a proper proof of withdrawl of money but they still refused. I also contacted a bank manager, he too told that no one other than NRI could help. Now, only an NRI could help me or any indian who was in foreign at the time of demonetization. Go to them with proper proof of withdrawl of your 50k. It's your money in the end and 50k is a good amount- hell any amount needs to be changed.
Many people have forgot their money or found it stashed away.
give it a try
I even tried with a foreigner, but why he be messing himself for a low amount of 50,000rs.
Yes, i know 50,000 inr is a damm good amount for any indian, let's see what will happen to them.