Irctc — need to register with the same now as I had before

Address:

Balasore, Odisha

Sir, I changed my registered mob no once in the user profile. Now, I want to switch to the previous no I had already. It is saying that the mobile number is already registered. I tried several times but fail to re register. User Name: tanaybsnl. Please, fix the problem, so that I can travel without Printed Ticket.
Thanking You
Tanay