Mechandiseebs — Was doing payment of my loan app fairmoney but after successful payment it was showing duplicate payment error

On 25 March I paid my DUES on fairmoney app of rs5567/- but after the payment it was showing duplicate payment error. And the money deducted from my postpe card but never received in receivers account. I mailed post pe customer care they replied me as ur payment was successful. I think some fraud had be done wid me.