I would ask the dealer you are servicing it through why the difference in price. it's possible if you only expressed concern with regulating the time (you stated it was fast) that their quote was for that alone and then Tourneau decided it needed a full service, hence the higher price. But what they told you was an estimate or a guess of what they think it will cost, not a quote and I find it reasonable in the grand scheme of servicing watches.
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