a simple reversal takes forever whereas its my money

I was doing an cellphone banking transfer and unfortunately I happened to send the money to the incorrect account. I called the call centre to ask for help, I was ridiculously told to wait until the incorrect client answers his/her phone and say yes to the reversal WOOOOW !!! This is money from my account I acknowledge that I did wrong but all im asking for is a simple reversal back in my account so I can pay the correct client. I asked why can't I give authority to reverse I was unanswered, I asked how long is it going to take still no answer, fine you are giving me a turn around time of 7days what happens if that person never answers the phone, do j lose my money, if I go and dispute this what difference is it from doing it over the phone???' I AM ASKKNG WHY, CAN SOMEONE HELP ANND GIVE ANSWERS ASSEBLIEF TOG!!! mistakes haplen but there must be some sort of a way to solve them effective and efficiently