Bad service

Bought a brand new G&G ak 74 E from them, 12 hours after my purchase the guns gearbox slipped and didn't want to fire. Took it in for repairs and the gun was working again, after the fix it worked for about +- 300 rounds and failed again, so took it back in and spoke to the owner Henry and was informed by the manager Jason that I would be getting a brand new replacement but instead I got a used gun. When I asked why it had marks on and it doesn't look like a new gun,they told me that they gave me a used gun cause I damaged and worn out the gun after using it for less then 1 hour! Spend 10k in a shop and that's the treatment never returning to the shop !