No cancelled via the app and it says fee will be charged to card that the ticket was charged to.I think you have to pay a refund fee to get the points back. Have you called and done that?
KrisFlyer - Forms and Fees - Service Fees | Singapore Airlines
A nominal fee will be charged for certain ticket and membership-related changes. Find out more on redemption ticket-related charges and your eligibility on waived or reduced change fees.www.singaporeair.com
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What’s the best number to call?Sorry, I’ve never cancelled a SQ award. The call center is good to deal with and won’t charge for asking about the process. Check if the fee has been charged to the cc first.