Reply from Agony UncleHi, Thanks for your questions!
Please refer to the following answers:
1. They can unless you prove that they have given your express cash cheque to a certain individual who acknowledges receipt of payment each time.
2. They can but that is not a bad deal for you.
3. Usually the middle man will abscond and that would not stop Company A from suing you.
Agony Uncle
不穿马甲来顶,终于搞懂Agony Uncle 啥意思。