As the title states. Don't buy gold. Once they have your money they could care less what happens to you.
I spent $10 after a few days into the game to use solely for oil repairs and I had my fun with it and ran out. No issues. Start alliance war. I spent another $10 yesterday to do the same thing I initially did, use it solely to repair my units. I attacked quite a lot in war zone and went from 1,200 to 839. No issues yet.
I decide before I log off for the night to upgrade my barracks defenders. The upgrade cost 225,000 Metal and 2,500 Thorium. I had 257,**** Metal and 20,000 Thorium. I had enough resources. I click upgrade. The upgrade goes through but all my resources are still there. It used 550 gold instead! I went from 839 to 289 for something that only took me 30 minutes worth of grinding in PvP.
I submit a ticket. They close the ticket, it says "solved" in bold italics and they have removed the ability to comment. They stole my gold and are silencing me! I won't be silenced. This is garbage customer service.