Duplicate payment paid to beneficiary due to technical error on the app.

Duplicate payment paid to beneficiary due to technical error on the app. I then call the call centre 1st and wait forever, only to get transferred to Internet banking, which is another 10 minutes of waiting. They also can't help, only advising me to call the beneficiary instead and ask for them to pay me back.

Why have an app, if it's forever buggy!! I need to be guaranteed to get my money back, please!