Appeal to tds for refund

How to File an appeal to TDS for refund under sec 194 IA online. 

I have paid TDS u/s 194IA, after I received an intimation from TDSCPC through mail. 

Currently, I want to appeal for refund as the data provided by the registrar was wrong. I contacted the TDS officials in Kolkata, but they are unable to provide me any information as to how to file an appeal online in the website www.incometaxefiling.gov.in