ZARA won't pick up return items

I bought clothes from ZARA online, on two separate orders (ORDER NO. *** & Order number:***). One of the order boxes came with a water damaged box and the clothes were damp. this I reported from on the live Chat platform & was advised to return the damaged clothes. For both the orders I logged returns on the 10/01/2020 and as per instruction on the return slip was instructed to take them to the nearest and PostNet Phalaborwa advised me that they don't offer return services for ZARA. I then returned customer services who kept on sending me same Postnet return slip which compelled me to try another platform , Facebook. the facebook ZARA page administrator has been making promises to pick up the clothes from my place 7 on two instances its been a no show.

Made another order which arrived yesterday (Order number:***) & I have items I wanna return but don't know how to go about it since ZARA hasn't been coming to the table.

I am frustrated as I am stuck with clothes I don't want and ZARA wont come pick them up so that I receive my refund.