Woolworths - incorrect processing of refund - PayFlex

I purchased 2 items online on the 20th & 23rd of May 2025 respectively. I opted to use the PayFlex option. I returned both items to the Woolworths branch in the Southern Centre Bloemfontein (store 3127) on the 30th of May 2025. At first they said they cannot assist me since it was a PayFlex transaction, however I insisted to be helped since it was indicated on the Woolworths website that any branch can assist with this. I received a full refund on both items. PayFlex keep on debiting their installments and upon enquiry they said that the branch should have given through the information to PayFlex in order to cancel the installments. I am now paying for items I returned and PayFlex refuses to cancel the installments, since the Woolworths store did not complete the transaction correctly. Order nr: *** and ***. Transaction numbers 53257 & 53258.