Today around 11:15 - 11:50 (EET) one of our server experienced high load which in turn resulted in message forwarding service being unreliable.
As the server could not respond to the request in time or failed to respond at all, it caused the service on another un-affected server to re-try sending the message to the operators. This in turn caused some messages to be delivered with a delay or in some cases also multiple times.
We solved the server load problem and all the message processing . As the affected requests were made only from Messente's side, You wouldn't be charged for those.