Incometax paid to wrong head

May any person tell me about procedure of TDS Refund ?

Actually We paid Interest u/s 194A to Our Client of Rs.120000-10%TDS = Rs.108000

But at the time of deposit TDS

By-mistake We have deposited online  Rs.120000 instead of Rs.12000

This is my new proprietorship firm and my first TDS return filing date is 25th of Jan.,2016

may any person help me for refund claim ?

@ Ramakrishna:

You need to approach your AO and request for correction in minor head

@ Guddu Kumar:

The applicant deductor shall establish before the Additional Commissioner as the case is to claim excess payment of TDS in excess of Rs 1lakh and that:

(i) it is a case of genuine error and that the error had occurred inadvertently;

(ii) that the TDS certificate for the refund amount requested has not been issued to the deductee(s); and

(iii) that the credit for the excess amount has not been claimed by the deductee(s) in the return of income or the deductee(s) undertakes not to claim such credit.