I can think of two possible solutions......
Bearing in mind your use of the phrase "service centre" the first is to use a decent garage known to be honest and competent (not necessarily a franchised dealer). Do you have any Ford-driving aquaintances who have a good local mechanic?
The second is to get a plug socket (less than £20) and give them a quick tweak yourself to determine whether they're siezed.
Or finally - look at the number of Focii on the road compared to how many people experience this fault and don't worry about it!
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