Review Fail to deliver, impossible to contact

I received a message from the supplier to say that their courier had tried but failed to deliver my parcel - and that I needed to contact DPEX directly in order to avoid incurring costs. Firstly, I've had no message from DPEX to notify me of any imminent delivery. Secondly, calling them on their listed number only gets an automated response that the number does not exist.

I see that numerous other reviews below report similar dismal experiences.