Drive Dynamics - Bad advice, sub standard products

I ordered 2 x VSD's from this company, after being advised by them that my application is correct and the VSD's will work. I received the two VSD's... Both had the same model number, but they did not have the same technical specifications. Despite the physical proof presented (images are available), they are still claiming that the two VSD's are exactly the same, and refuse to refund me. Stay away from this arrogant company - they are fast to take payment, and slow to deliver service. They cannot be trusted. (Images and communications are available on request)