TDS recovery for mutual funds

Hello Folks: 

This is my first time here. I sold some mutual funds which generated a sale and the bank generated a TDS certificate. I have never dealt with this so I have two questions.

1) What is the deadline for me to file for recovery of TDS? It would be helpful to know where I can find the deadline. I couldn't really figure it out from the IT calendar.

2) I registered for filing ITR using a mobile number that I do not have. Is there a way to change the number - the system keeps sending the OTP to the old number but I don't have it. I opened a grievance ticket but no response. 

I will be thankful for your help. 

Thanks, 

Amit