Flipkart Pay Later — refund outstanding double payment

My name is javed. My february month 2020 outstanding bill amount 3897 rs. Due date is 10 march 2020 but i forgot payment and i have payment done 13th april 2020 bank of baroda upi 3897/- rs paid transaction id-s42669184. Then after recovery team call me and told me your outstainding amount is due and your payment amount has been not rececived, and i m asking i have payment done but executive he told me your payment has decline so your payment has refund 7-10 workind days so please your outstanding amount with late fees 4097/- rs.
So, i have paid 2nd time payment 4097/- paid by upi bank od baroda is date of payment 17th march 2020 transaction id s70220006.
I have contact to customer care but not proper answer and send mail 10th april 2020 but till date not reply.

So, asap refund my money.