Refund request

I requested a refund from an online shop and was informed my refund was successful from their side. And assured that my refund for this parcel will completely reflect in my original payment account in 2-14 business days. The refund amounting to ZAR 701.00 was successfully processed back to the original payment method that I used to pay for my order which is my Capitec account. I was informed by the seller to show to my bank Capitec the proof of refund. I went to their branch to enquire about the refund and was given an incident number and was told I’ll get my refund after 14 to 30 days. After 30 days I went back to the branch with the same incident number to enquire and was told my case still active and I must wait to be contacted by Capitec regarding my refund. Days after I then got a call from them telling me that I authorised the transaction and there’s nothing they can do to get me back my money. Capitec stole my money because this refund transaction was processed on the sellers side and I was given proof of the refund with the transaction ID reference number.