HDBFS — false disclosure of roi during loan offer

Address:

RM NO 1 GANESH BHOIR CHAWL SHIL RD, OPP MAHALAXMI COMAPANY GOLAVALI, DOMBIVALI EAST, Thane, Maharashtra, 421203

Hi this is regarding loan i have taken from HDB financial services loan A/c no.6855821.
At the time of loan offer agent convinced us with low rate of interest however when I received loan welcome letter it was 21%. I talked to them and they said after completion of 6 month they would change the ROI however they not changed and now i want to close my loan for that they are telling to pay 4.72% extra foreclosure charges which they are claiming free before.

Only one mistake was done by me to sign the agreement in blank on his verbal assurance and later on they filled anything in that.

Please look into this and help to make it easier