PayUMoney — money stuck in payumoney wallet

Website:

PayUMoney.com

I recently wanted to use payumoney wallet for a transaction. I tried to create an account on payumoney wallet. I rediscovered my old account on payumoney, i went on to use it and added rs. 5000 to it.
Now, i proceeded to execute the transaction. The transaction required an otp. This is when i realised that the olf account i had decided to use had my old mobile number which i no longer use. It belongs to someone else now and otp is going to someone else.
I decided to take the next most logical step, update my mobile number. But, no, you can't do that in payumoney wallet account. Now, i have rs. 5000 in my payumoney wallet account which i can't use for anything. It is stuck in the wallet! Quite frustrating!!!