Kalyan Jewellers — Complaint regarding the scheme dhan Samriddhi scheme

Hi,
I am writing this mail to find your attention towards a serious issue that i am facing because of kalyan jewellers
I actually bought a scheme on 18april 2021 for 6 months from kalyans mohali, in which i had to pay rs5000 each month and i would be getting 37.5% interest on my amount making my final amount to be around 37000rs at the time of maturity of my scheme i.e. 18 oct 2021
But now on talking with kalyan’s mohali they are saying that I have earned only rs1800 as interest as now they are mentioning that the interest of 37.5 % is applicable only on the first instalment but it was never told to me when i bought the scheme and neither it is written in the documentation i signed to join the scheme.
Please look into the matter as this is a serious issue and very important to me as kalyan’s customer since 2012

Regards,
Aanchal arora