Scanwatch SpO2 Failed

Has anyone had the SpO2 feature fail? After diagnosing with their support team I was told it was broken and to use a 25% off voucher for a new watch as its out of warranty. I would not expect a product, of this cost, to have a key feature fail after 25 months....

Has anyone been successful in pushing Withings to get a better offer than a 25% off voucher?