Unhappy Medipost client

Medipost contacted us to inquire as to my husbands medication, they wanted to send an alternative with a co-payment. We said no and as such left it there, they then decided that they will, without proper authority still send it and just bill us. We received it and if it worked would still have paid although very unhappily but the medication did not even work and had an adverse reaction to my hubby. Now they want to hand us over for the medication that they sent without proper authorization but it also did not work. They lady confirmed that she listened to the recordings they took and confirmed my husband authorized it (which he did not) and when I requested that I receive a copy as confirmation they told me that they could not send it and that I needed to take their word for it. Ultimately, I told them that if they can send me proof that it was him, I will happily pay