What's the correct service routine as two different Audi branches told me different things.

Mannnnnn my head got spun hard I called Audi Harold wood told him I need a minor service as Audi Chingford said major, minor, minor. He tell me he's been working for Audi for years and that's wrong! Major, minor, major is what Audi recommends he said uve been told wrong. I said ok give me a major Chingford told me spark plugs are separate from service he said no that's wrongs spark plugs included in full service price of £329. He even put in a little jab we much better then Chingford. Who telling me correct Chingford or Harold wood? Is it as Chingford said major, minor, minor, major. Or harold wood major, minor, major?