Refund issue at PEP Stores Cleary Park

I just had the worse service at PEP stores, Cleary Park whereby they made me the customer a ****... I bought items on the 6 of December 2023, unfortunately a few days later I returned an item for a refund with the original invoice, they insisted to keep the original and told me to take a picture of the original and kept the invoice for their books...unfortunately again I had to return an item on the same invoice, I presented them with the picture of the original invoice slip...they refused to refund me on the basis of me not having the original invoice slip...yet they kept the slip and said to use the picture in future....I was send from pillar to post I eventually called the customer service after a few calls they also refused to refund as they claim "its their policy" with no policy of such on any slip or clearly visible in their stores for customers to note.... Of course I argued with them until they found the original in their files after I was made a **** that they insisted they gave me the original back.... This service is not accepted , we never complain we allow that these stores treat us so bad ...I am still very upset at this service I received at PEPS Cleary Park The manager and staff member Marisa are not helpful at all...