EarlySalary — payment already made but they are again asking for same payment

Address:	Pune, Maharashtra
Website:	earlysalary.com

I took a loan for rs. 18000 from "early salary" and it was to returned in 3 emi's of rs. 6459 each on 20th of each month from february to april.
There was some problem with their mobile app so, they asked to transfer the funds to their bank account. I made the payment on 20th february, 2018 (Utr[protected], but they are denying the fact that they have received and are asking for the funds again.

I have confirmed with my bank, the phone pe app, and they have all agreed that the amount has been credited to their account.

Please help in this regard.