Demand payment for good I never receive

I placed an order with Homechoice in last year - send them several mails about my address that had change. After several calls and mails I found out they send my parcel to the wrong address. <br> <br> After request a change of address and to resend my parcel they never send the parcel but the goods is invoiced on my account and now I must pay for something I never received. <br> <br> They just keep on calling and calling and at this stage I am really irritated for all the phonecalls and they even listed me on ITC for not paying my account. <br> <br> After I told the guys they must sort out my account the one lady ordered me that it is not their problem and on the system it shown that the parcel is been collected and that I must pay the outstanding balance and that they will keep on calling me no matter what.<br> <br> I am not going to pay the money for the order I did not receive - I even invite them to come and have a look in my house if the parcel is here with no response. <br> <br> This is really upsetting because I got listed for good I never received.