Instant Money ****** me, prestige bankin cant help

I sent my mother money via instant money on sunday, (transaction history confirms) she goes to Ga-rankuwa standard bank branch to cash it..... She couldn't as they told her instant money had technical problems, I called Prestige banking to seek help but was referred to instant money dept. their number is constantly saying its conjusted. I tried to reverse the transaction but it says I have no transactions to reverse. I took the voucher number to see if its been used, guess what \It was used