POOR PICK-UP PROCESS AND POOR FURNITURE QUALITY!!!!

I have been a loyal customer since 2018. They have quality appliances. However, the process of having them collect a parcel is infuriating. I ordered a black couch and it’s of such poor quality. The cushioning is so thin, nothing will be left of the couch after a few months. I have had this horrible couch for 3 weeks now. I can’t even sit on that couch. That’s how uncomfortable it is. Constantly following up. They have a third party courier which they are not able to contact directly (conveniently). They won’t give me a number to contact. I don’t know how else to escalate this.