Regarding 26AS

Don't do anything, while filing ITR....... generally it gets nullified as and when the deductor rectifies its TDS return.

At most, may be reported to ITO (TDS) about wrong entry, not connected with PAN.

Yes....... follow form 16 only......

No need to report it urgently, you may write under 'Grievances' after login... ...

Most Welcome, Dear ....

Thanks for updating......Dear Venkatesh......