Refund a transaction send twice By mistake, I have send second time 0.09923 BTC
to bitcoin address: 15qMMPEa4M26XX4KqXxrvD5yjNwfETg3Hx via transaction id:0a5c7ea12bd84b1dfeea4972d6415c28d6846d83c5fb00f56cf4f6d20c05f4da

I did the transaction twice. How to refund it ?
You cant do basically nothing from your end, as you have lost the control of those bitcoins.

One thing that you can do is to ask the recipient of the transaction to refund. If he refunds you will get back the bitcoins.