Dishonoured voucher

My husband bought me a R1500 voucher for my birthday in 2019. There was no expiration date. I tried to buy jeans in the store but none were to my liking or they were out of sizes. This went on post COVID and I then tried to purchase through their online store. My purchase was declined. I contacted the company and was informed I could not purchase sale items or discounted items. Unbeknown to me the company changed ownership and they have declined to honour the voucher or to refund the R1500.