I can't tell if this is a genuine question or not, because if it's genuine you're giving the OP an extremely ungenerous reading. "They didn't tell me I couldn't

I can't tell if this is a genuine question or not, because if it's genuine you're giving the OP an extremely ungenerous reading. "They didn't tell me I couldn't sell them until after I'd already purchased" doesn't mean "I couldn't sell the coins until after I bought them, and I had no idea that was the case because I don't understand the basic concept of transactions." It means "I wasn't allowed to sell the coins, and they didn't tell me that until after I bought them."