Income Tax E-filing Portal has posted an update that:

“Surrender Form 10AC” functionality for surrender of issued Form 10AC and refiling of Form 10A in same/different section codes has been enabled on the portal.
Reportedly various forms are now available for filing on income tax e-filing portal. However there are some glitches in the portal but the portal is running smoothly now a days.

The Income Tax Department has provided two e-mail IDs for any problem or complaint faced by any taxpayer. You can voice your views on these e-mail ids: