Why should I pay service that is below par!!!

In October 2021 I bought a storage bed. About a month after receiving the bed my husband assembled the bed then we discovered that the gas lifts did not work at all. I then informed cielo. They wanted me to send the entire bed back not just the gas lifts to replace them. They also wanted me to pay for the packaging and courier service after they were the ones who sent me a broken gas lift to my new storage bed. I had already paid to have the bed couried so it's not my fault they sent me a broken part. They did not want to help me at all till I mentioned hello Peter. But in the end they insisted on me paying the packaging and courier service for them to collect the bed and test the faulty gas lifts. Why should I have to pay when their quality checks were not in place hence I got a broken gas lift to my bed. They should just own up to the fault and we can then all move on with our lives.