Absa App is *******

I tried to make an immediate payment to a service provider but the Absa App kept on returning a message that my preferred method of contact was wrong. Eventually I reverted to making a normal payment, which went through. However, 3 hours later, Absa processed the immediate payment as well, resulting in this service provider now being paid twice. When I tried to get Absa to reverse the payment, they told me I have to wait 21 days. I am a pensioner and I can't wait that long to get R2500 back, I need the money now.