Nedbank worst Bank highest fees

Nedbank is the worst bank as far as customer service, fees, applications and problem resolution is. Yesterday my husband used online app to load 1 gig on my phone, the app is just like the staff not consumer friendly. Today my husband used the online application to trf R600 to a 3rd party at Absa the application showed unsuccessful witn a button retry so my husband pressed retry and transaction went through. On checking our bank acc transaction was deducted twice and now Nedbank is saying we have to pay nearly R400 to reverse the transaction. Or we must contact the person WE paid twice and tell him to give us back our money. So twice there was a problem on their online application, but it is not their problem,, no need to be investigated, no need to look after your clients. You can no longer charge the massive banking fees claiming you make a difference. You should be ashamed as the top bank for this.