Cayenne S diesel - adblu help please

[nutsytvr]

Just tried filling at local garage using their pump, but can't. Pump nozzle fits in filler neck ok, but when pulling the trigger, it only pumps 0.2ltr then clicks off. Tried 2 pumps, same result. Garage man also tried, same result. He says pump is sensing full tank and stopping.
I know it's not full as 5500 miles since last fill by OPC.
Any ideas please?
Am I stuck with using 1 ltr bottles or going to OPC?

Thanks in advance

Paul

[nutsytvr]

Thanks for the replies. Looks like I'm stuck with using the bottles.
Paul