Online Order Delivery Disaster

I placed an online order for 2 x pink facial headbands, 1 x 2pack grey secret socks and 1 x Sissy Boy Jeans. I received 2 x pink facial headbands, 1 x2pack grey secret socks and 1 x NIVEA FACIAL WIPES!!! No jeans.

I notified Foscini about the error on 1 June 2020. Today I received an email from them:

"Good day Thank you for your email. Kindly be advised all items in your parcel reflect successful delivery on the 28.05.2020" I then contacted the cell number on the Invoice for the Nivea Face Wipes, and asked the nice lady if she ordered these wipes and she explained to me that she indeed ordered them and never received them - she too has been struggling to get information about her parcel. She however, did not receive my jeans.

So by the end of this month, I will be expected to pay my installment on my Foscini account for an item I did not receive. They however, show no interest in rectifying the issue.

What can I do to get this issue resolved?