I realise that in theory that you have this.
I also realise that it can get very busy.
However, it is very very frustrating to need to unblock your card and see that the message is ‘Not read’ and ‘this may take up to an hour for a response’.
So my super original suggestion is that you either do not pretend to have a response system or have one that actually responds within a reasonable period, such as say a minute or two. NOT AN HOUR!