Poor quality and poor after sales service

I am utterly disgusted in the Foschini groups team. I bought a dress on my account on the 21st December 2017. Never wore it and still to this day (28 February 2018) has the price tag on. When I finally wanted to wear it. I notice the stitching is coming lose an what looks like a tear. Now having never worn this dress I was horrified. When I asked my mom to return it for me. Foschini has the nerve to want to give me a voucher which I don't want instead if refunding my account. Now nowhere in TFG damaged goods policy does it state anything about a slip or voucher instead it says and I quote "Six month return policy for defective goods allows you to return goods within six months of date of purchase, provided that:

• The goods must have been used for their intended purpose. • The goods must have been cared for according to the instruction manual or the wash/care instruction label.

We will either:

• Repair or replace the goods; or • Give you a refund in the same way that you paid for the goods"

So please foschini explain to me why I should have to pay (by taking a voucher i don't want) for poor quality clothing that you sold me.