Letting agent reviews for Mountgrange Heritage, Notting Hill

I asked the agency to release me from the contract as I couldn't sleep due to the vibrations in the bedroom. They ignored my emails and would not return my calls. I had to chase them on the phone. My GP sent them a letter saying that the vibrations were causing my headaches, but still no response. They refused to call an engineer to look for a solution and just kept saying that they never had anyone complained. Which I then found out was not true. There were tenants who lived in another flat on Pembridge Villas who also had the same problem with the same agency - Mountgrange heritage Notting Hill. I installed the app that was measuring the vibrations and sent the results to them, but unfortunately, they ignored it too. The engineer's fee was over a thousand pounds which I was prepared to pay as I was desperate to move out but they needed to lift the carpets and the agency/landlord didn't allow it.