Very poor service from Ovo

Is there actually an easy way of talking to Customer Services? I've been waiting on online chat for an hour and I'm still in a queue. All I need to do is register for the new Ovo app so I can add credit to my meters. One would have thought registering for an app would be simple and straightforward. Apparently not, as Ovo insist on telling me I've entered the wrong account details. I haven't got time to wait any longer as I've got things to do. Don't Ovo realise that people are busy and haven't got time to sit around all day?

So, I've wasted all that time and still can't use the app. Now what do I do?