Raw Chem - questionable business practice

Raw Chem sent product we did not order, but they insist we did. They cannot provide our company order number, mainly because we did not order. They sent product anyway and refuse to collect it when asked. They claim the products they send are "really concentrated" so that is why they are so expensive. We can't verify this claim as we haven't used the products - mainly because we never ordered them. They then regularly harass for payment, and refuse to accept return of the unordered product as an option. and threaten legal action if the payment is not processed. Don't entertain telephone calls from Raw Chem.