Deposited tax not credited to it dept

1.You should confirm that ur computation is right & u have copy of challan deposit. 

2. Then find where is the mismatch. Is there any mistake from ur side while filing the return or there is computation mistake from IT deptt.

3. After finding mismatch u may file online rectification u/s 154 for that particular mismatch.
 

Actually i found out the mismatch.
The self assessment amount of 1500/- was deposited by me but while making on line payment i wrongly typed assessment year as 2012-13 instaed of 2013-14.So it is not visible in 26 AS for 2013-14.
Now,i was thinking of correcting the challan ,but it looks it is possible only within 7 days of submission,while i had submitted on 27 th july 2013.
Neither my Return filing support nor IT dept highlighted the mistake.
Now what is the best method to come over the issue.
 

Dear Sir/Ma’am,

Thank you for contacting us, it is our pleasure to assist you.

With regard to the your query, you are requested to contact the concerned jurisdictional Assessing Officer and raise your concern.

Note : Please note that online Facility for PAN and Challan correction in TDS statements is now available at TRACES (www.tdscpc.gov.in). Please refer to the e-tutorials for necessary details.

Regards,
Team TDS CPC

However when i attempted that i found that is possible for deductor and not for Tax payer.Who will be Deductor in this case?
What may be the best stratagy.Should i deposit tax and sit cooly and forget 1500/-