Could you please elaborate on what you mean with "doesnt give the right tarief in the right time"?
Are you referring to the message stating; "Important: call charged at peak rate"? I believe this is just a general warning to prevent people from overusing the Triiing application. A reminder that, unless they have the option Freephone Anytime, their calls will be a charged.
Though I didn't find any specifics about the tariffs in the Triiing application itself.
Now that we've got the business part behind us, I am wondering why you're writing in half English, half Dutch?