Gaursons — No response from their customer care over the mail

I have booked a flat in 14th avenue now i have completed my all the payments to gaursons now they have put some interest on me because of some payments delay, for which i have already given all the proofs to their customer care team by personally visiting their office so many times but they are not updating my interest statement... I have also written so many mails on their customer care id but they are not responding back to me. This process is very harassing for me

Thanks & regards
Umang rathi
+91-[protected]