2003 Honda Civic Service Damage

Hi - had a full service done last fri (plugs, oil & oil filter replaced etc) then took it for a drive of about 100 miles on the Sunday & next morning a major oil leak on driveway, strange engine noise & oil light lit up on dash.

Oil leak apparently from cam shaft seal (it was pouring out when started & on the hoist) but not related in any way to the service according to the repairer?

Repairer then replaced cam shaft seal & timing belt (due to oil contact) - my question is could the mechanic have caused this problem in some way? The car has had no problems since I bought it 9 months ago.

appreciate your help

C