✔️How do I change my address so that I don't miss the refund cheque?
You can log in to the Income-tax e-filing portal and make a Refund Re-issue Request. However, this works only if you did not receive the refund cheque and it was returned to the Income Tax Department.
✔️Is there an option to change contact details from what I provided in the ITR?
Yes. You can do this on the Income Tax e-filing portal, on the 'Profile Settings'. That is where you will find the 'Update Contact Details' section.
✔️Will I get a TDS refund even if I have not provided my bank account details in the TDS Certificate or Income Tax Return?
Your correct bank account details must be provided in your TDS Certificate. Otherwise, any discrepancy might result in a transfer of refund amount to the wrong bank account.