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
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Circumnavigator, lawyer and columnist and the man who divides his time between Singapore, Hong Kong and China. I believes that etiquette transcends nationality and race. 
In this column I will offer stylish advice to everyday questions on etiquette at work and at home and anything else that may be bothering you.