LESTER

Hi, Have 2010 Berlingo First van. Odometer keeps jumping, on one occasion 3,000 miles ! Have taken it for diagnostic test at dealership, but they failed to find fault. Next stage is a complete strip out, which will be expensive. I have had van since new and I am only driver. I estimate it is showing 15,000 miles over true figure. Has anyone else had a problem with mileage recorded being faulty ? If so, did Citroen admit problem, as it would appear this is a manufacturing fault. Any help, information or advice, welcome.