Appalling online service and delivery

Worst online service ever. I ordered my books on the 4th of September and they were due for delivery on the 16th Sept, 2 weeks past estimated delivery date and I still don't have my books. I called them to enquire and they said they'd call me back (nobody called me back), i reached out on twitter, twice, and they ignored me. Such appalling service, 1 October, i still don't have my books and zero correspondence