OK. in canada, anything u do, u need write it done. That's called "proof", or better name "agreement".
Same as u go shopping, u get receipt. For order long distance call, door-to-door news paper, and also Sympatico Internet. U need to keep a copy of what u orderd. Don't forget ask them leave their name, phone number and sign it.
In most time, there should be two copies, you keep one, the seller keep one.