[Closed] Asta G (2004) oil pump seal

I have a 2004 astra 1.7dti. I had a garage fix my leaking oil pump seal and replace my cambelt 10,000 miles ago. Dropped my car in to have a major service this morning at the local dealership and they have told me that the oil pump seal is leaking again.

Anyone with any experience of these engines. I think they were made by Izuzu. Is it possible that the leak has happened again and it's bad luck? Or, is it due to the other garage doing a bad job when they fixed it last time?

any info would be great.

cheers

J