I had a similar fight with Standard Chartered in Hong Kong when they decided Nadaman in the Shangri-La is not a restaurant.

Although it is possible some restaurants in hotels are coded as hotels, in my case my slip clearly identified the biller as "Nadaman, Island Shangri-La Hong Kong" and spending category "Food and Beverages".

I got my points back after writing them a hard copy complaint letter with a copy of the slip attached, but not before they incorrectly credited another transaction twice instead of the Nadaman transaction.

I have an even longer query with Bank of East Asia here when they were asked to confirm whether Fresh Mart underneath Sogo Department Store in Causeway Bay was a department store or a supermarket. Given BEA's appalling history of customer service, I wasn't satisfied until I got three positive confirmations that Fresh Mart was coded as a supermarket.

I hate these category promotions.