Supplier and manufacturer refuse a refund

I purchased a LG washing machine online through ao.com 8 months ago. After a few weeks of use It started making loud noises and vibrate excessively. Five months on (since I reported the problem) and with the visits from 3 LG engineers, the issue remains unresolved. No-one wants to take any responsibility for this washing machine being faulty. The LG engineers could only find one excuse, the flooring! (assumptions they make without checking the machine), however when they produce reports, they say that they found no faults. Machine was installed according their instructions and they checked and confirmed that it was installed correctly. The problem with this particular type of washing machine was reported by other customers across the Globe. The LG engineers are basically telling their customers what they have been instructed to tell by their head office and ignore the real issue.The supplier (ao.com) I purchase machine from, accept the reports from engineers and don't trust me that the machine is faulty. I sent them a recorded video showing how the machine is vibrating, jumping and how it makes a loud rattling noise. Both ao.com and engineers agreed that this is abnormal but they still refuse to give a full refund or exchange for a different washing machine.
Any advise please?