Clinihealth does not refund on returned goods

I purchased a product from Clinihealth in Boksburg, South Africa a few months ago. The product was not suitable (not their fault) and so I returned it for a refund. To date, I have not received a refund or proof of payment despite asking.

When I phone to follow up, there is not answer to the landline number provided on the website: https://www.clinihealth.co.za/