Online fulfilment is a disgrace

Online customer service is a disgrace. On Black Friday I ordered a number of scatter cushions. The delivery was short 1 cushion that I paid for. I have sent 5 emails on this and phoned the call centre multiple times and reported it through WhatsApp. No one responds or they promise to investigate and no one gets back to me. This is utterly disgusting and dishonest business practice. I am shocked and disappointed. Their customer service line should be renamed from Help->Hell