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That's a big job though - to refill and then sand it you'd end up damaging the finish on the boards, and needing to sand and finish those all over again.
Which company did the work @rogan?
They've just used totally the wrong product. Can you scrape it out and the refill the gaps with the right colour product?
e.g. https://www.amazon.co.uk/Osmo-water-based-Woodfiller-250g-Teak/dp/B00HNQJGHC