58 Liters filled into a 50 liter tank, *****?

I went to Caltex Le Mans in Montclair on the 27/07/2019 at 20:35 to fill up my 2014 Renault Duster 1.5 DCI. I have filled up my car numerous times before but this time something out of the ordinary happened, the attendant filled 58 plus liters. I immediately asked the attendant what was happening and he said that its still taking and we checked for leaks. Then I Googled the car tank size which is 50 liters. I have queried this with the branch as the car was not empty and I do not feel this is possible or correct as I filled up twice thereafter just to be certain and this could not be repeated. I am dealing with Marvin from the garage and he insists that the pump is correctly calibrated and that is was checked and certified recently, however I don't trust in this as it not possible for 58 liters to go into a 50 liter tank. Furthermore a tank that had fuel, I suspect that there are problems with the pumps as the video footage shows the attendant did not do anything strange.