Wrong ay punched while tds payment

Friends

While online paying TDS in August 2015 for July deductions, AY 2015-16 was punched in place of AY 2016-17. 

Now, I believe that bank will not be able to correct the unintentional error. We have to approach the TDS AO.

But the question is how do we ensure that the challan is rectified. Unless we file the quarterly TDS return in 24Q in October 2015, and then verify 26AS of the deductees, things will not be clear.

Is there any other way out. Please share.

Regards

Dipjyoti Majumdar