Flipkart — Cibil score impacted even I had paid all payments on time

I ordered some products throgh pay later payment later i paid all payments ontime
But flipkart is not updating to financial partner all the payments
Now financial partner is calling me and asking to pay all the payments and they are reporting to cibil that i was not paying
I have complaint to problem flipkart customer service 20 times but no one helping me get solving the issue
Now my cibil is decreased from 770 to 636