Takes money and doesn't deliver products

We get charged for parcels that don't get delivered. When you phone, then there is always an excuse. In June I was billed double, but did not receive the parcels. I phone Hachette on 17 July to find out why I was billed double, but have not received any parcels. The consultant I spoke to told me that there were two parcels dispatched on 26 June and that I should give it until the end of the week (20 July) to receive my parcels. I have still not received them. I just called them again and spoke to Mick/Nick (not sure). He tells me that another parcel has been dispatched, but that I must be patient because the post-office is on strike. When I question this, he tells me to go to the post office with my membership number and try and find out where my parcel is. I told him that since there was no "tracking number" there would be no way for the post office to track my parcel. Yet he still insists that I go to the post office and try and find my parcels or that I should wait until 15 August to receive my parcels. I find it strange that Hatchette's parcels don't get delivered, but all the other mail comes through just fine. So, where is the problem? Is Hatchette just incompetent? Are they just trying to get money for products they are not delivering? Or is the post office on strike? It just seems to me that it is always easier to blame the post office being on strike than try and find out where the real problem lies.