Dishonest business practices

I sold Avon, a order was placed on my behalf by my sales leader using the incorrect delivery address. This parcel was sent back to Avon and signed for by the courier who took back the parcel. I have sent proof of return to Avon by email on 18 Aug and did 2 or 3 follow up calls. To day there has been no response from Avon but they are threatening to send lawyers and give me a bad crdit record. Avon sort out your own house and stop threatening me. You have your parcel. I would not advise anybody to join them.