Poor service - cant even get through to the international desk

I received an email stating I am receiving a parcel from Mango. I am expecting 3 parcels and the email did not specify which parcel it is. It is a standard email. I responded back with the form filled in for 3 parcels (3 separate forms). I tried calling the number 4 times yesterday. Twice to the international department and there was no answer. The other 2 times I asked switchboard to put me through to the international department and the line said the person is not available at the extension. I received ANOTHER email from DPD for a Mango parcel today. It seems they did not read my previous email and now they send another email again for a Mango parcel. I tried calling again today and there is no answer at the international desk. I call the switchboard and she puts me through to someone who is not available. I call switchboard again and she puts me through to someone where the call gets cut before even going through. This is really bad service. I am receiving emails with a form to fill out with no details on which parcel I am receiving and I cant get through to the international desk. Really poor service.