whats up with my renault?

meganic scenic 01 plate, on board computer shows milage
trip display. But when trying miles per gallon/and fuel management,ie fuel left to get to petrol station . these are flashing, the manual states if flashing get in touch with renault.Have done this they informed me to bring it in, as on board computer fine ,just needs resetting, at a charge of £50.00 before they even look at it.
is there any wise person out there who has had same problem and fixed it cheers carl.

carl thomas
October 2011