Pointing fingers

My wife bought couch covers online, only to find out when they arrived that they are too small. We took them back to the Greenstone branch where a friendly assistant informed us that they are a Heartdeco product, not a Leroy Merlin product and we must contact them. We were fine with that. I emailed Heartdeco. No response. Yesterday I messaged them on FB messenger and the first response was “speak to Leroy Merlin”. When I objected to that because of what LM had told us, I was told to email Heartdeco. Told them I had, with no response. Then Inwas told that “ they get so many emails”. I can see where this is going. In the meantime we sit with products we can’t use and R800-00 out of pocket and everyone is pointing fingers at each other. Leroy Merlin, this was bought on your platform, therefore I believe the onus is on you to handle the return. I am not interested in playing games. Simply want to return the product and get a refund.