Unilever - Bad customer experience

I have been communicating with Unilever since August 2019, the short story is I have bought Ponds facial products which didn't work for me & the 3 items were returned to Unilever. They then supp**** me with vouchers to use at Pick & Pay but they only stock Ponds in the Unilever range so I had to replace with Ponds again, this time I tried another range. This also didn't work for me and once again they have collected the items but now they don't seem to understand why I need another refund! These products have cost me around R600 initially and I told them if they don't want to refund, they must send the last batch back to me so I can at least use it as feet balm! I don't receive any feedback now, I have even tried on Facebook and on 23 Jan I was promised feedback, I followed up via this link on 30 Jan but no response until today. This is not a fair towards me!