They can't do that because the same spare parts are used by the manufacturer's official support. Νow in case they say that spare part X costs 100euros but only

They can't do that because the same spare parts are used by the manufacturer's official support. Νow in case they say that spare part X costs 100euros but only 10 if we do the repair, the regulators could easily jump in and fine the company for unfair tactics. Of course such tactics should be taken into account in the relevant legislation Edit for spelling errors