But could not the summoner of the spirit order the spirit to attack the summoner?
The summoner can use its 'summoner - spirit'-link to have the spirit perform services.
Each task cost a service and once all services are used up the spirit will return to its own metaplane.
Book doesn't explicitly say you can use manipulation spells on spirits to order them around without spending services.
I am pretty sure the manipulation spells you are talking about are
not intended to be used to have the spirit perform tasks
without spending services (or even perform tasks that are out of scope of what regular unbound or bound services permit). Stop trying to break the game =)
Having said that, book also doesn't explicitly say you cannot use them on spirits.
If you and your GM
really want manipulation spells to work on spirits as well (as mind raping magicians are not powerful enough as is) then you are free to rule that. It is your table. Your rules.
(but I would advice against it).