Refund of EVERGREEN LIFE MANUKA HONEY in Singapore

According to the media release by AVA - Agri-Food & Veterinary Authority of Singapore, they are working with the importer to recall List of Evergreen Life Manuka honey products from Singapore market immediately. The products have been recalled because non-approved substances may have been used during the processing of the honey. Singapore food regulations do not allow additives to be added to honey. Consumers are advised not to consume the products and to discard them.

The list of recall Manuka Honey are in AVA website

I had bought Evergreen Manuka Honey MGO30+ 500G and Evergreen Manuka 100% Pure New Zealand Honey TA 20+ and had opened and consumed the TA 20+ for few tea spoon.

For MGO30+ 500G, I managed to get a refund from NTUC Fairprice . The cash refund is $27.80.

For Pure New Zealand Honey TA 20+, I bought it in Robinsons. Due to it was opened and consumed, the Robinsons only willing to refund 50% of the price ($45.60)  which is $22.80. Robinsons only issue gift card instead of cash. However I have checked the Metro facebook, the Metro is willing to refund 100% of the price regardless of opened or unopened. This make me wonder why there are differences in the refund prices??