Mistake in return

Well the return after being submitted isn't processed until the acknowledgement is recieved, however not sending it isn't the remedy.

(As per the image above) You should re-file the return, and inplace of selecting original return, select revised return in the general column of the ITR. That way you'll be able to revise the return, be careful you get only one chance to revise.....Once you submit the revised return, send this revised acknowledgement only to CPC. That should be all, hope it helped...

As per Income tax rule you can not revised the Belated return, But Practicaly CPC Banglore is accepeting the revised return u/s 139(5) of belated return. If they not accepet your revise return wait for assessment order. After assessment you can file rectification.

Or otherwise, am not sure of this one but you can go for physical return, file a physical return and that way your return will be processed.