Cred — Loan amount shown wrong

I apply loan(idfc first bank) from cred app for 15000, but immediately its cancelled (loan no[protected], but in idfc bank side sent letter for me pending emi, its affected credit score near by 400 points, i sent mail to cred app they told not credited to u and we will inform to them and rectify this issue, i sent regularly mail to cred app they told me within 48 to 72 hours again and again told me, for last 2 month still not rectify issue and not increase my credit score, pls help for me