No reply to query.

I ordered some products from Wellness, but due to Covid they were very behind in delivering which eventually necessitated me to buy elsewhere, but no big deal. I did not complain. After the delivered they sent me an email with a R100 voucher stating that they knew they were late and were sending me this voucher as compensation. Great! I placed another order and was then told that my voucher was 'not valid'. I made a call to their call centre and was asked to forward all the details etc. by email. No reply. I then followed up about a week later. Still no reply. Just rude. I won't be buying from them again. If the voucher was not valid then they could have just told me. I would have still placed my order. The fact that my call and emails were ignored is just not on.