Audi A3 problem when fuelling up - pump clicks as if the tank is full even when empty!

As the title suggests, I have just bought a second hand Audi A3 and when I take it to fuel up, the handle of the fuel pump clicks straight away as if the tank is full when it isn't. It keeps clicking after every 10-15 pence of fuel.

I tried inserting the nozzle in as far as it goes, then I tried inserting it halfway and also tried inserting just the tip of the nozzle into the fuel tank but it still has the problem. I have tried it at a few different stations and different pumps but it still does the same...

Is there any car experts or audi owners who have had the same problem or have an idea of what it could be?

Thanks