Payment installment of NON ORDERED GOODS

I got a call from one of the salesman at HOME CHOICE in April and he said that the is a competition running and the price value is R5000. He said I'm been selected. He said that they have specials instore. He will send me catalogue via WhatsApp, which he didn't. As after two weeks they sent a delivery of duvet covers and curtains . The delivery was received by my daughter's. And they opened it . I thought it was a price that I won because I didn't order anything and I didn't send any documents. I used the package. After 3weeks I got a call from Homechoice and they told me about the payment installment and I told them that they should go back to the call and come back to me because I didn't order anything . They've been calling me and I KEPT ON TELLING THEM THAT I HAVEN'T GOT A RESPOND ABOUT THE SALESMAN CALL, and now they are threatening about legal actions . PLS HELP Jessie Sbongile Ntshakala