Union Bank Of India — paid twice school fee

Respected sir/madam
I pnagalkshmi i paid the fee of my son in law of b. Sdurgaprasad 0f 2nd class studying in kendriya vidyalaya no 1 tirupati shift 2 first time when i done first of rs 1500 transaction it doesn't show any successful message so i returned back to merchant site and i retired to pay fee and i completed it successfully it shown a successful message transaction done after few minutes transaction done twice so please check and refund the money