Harassment of customer

Hello Peter, I have problem with home choice. I was called by one of their agent last year around November by one of their agent saying that they want to enter me into their competition since I am their regular customer, to my surprise I was called by post office officials saying that they received my parcels from home choice. I asked them to return them since I did not order anything from home choice.Now they are busy harassing me ,they call me every seconds concerning the parcel that i did not order nor receive and is frustrating me. Please assist me with this.