Undelivered and Poor Customer Service

I'm still waiting for a package since the 17 December. The driver spoke to me and I said the address needs to change as my offices were closed by the time they delivered. I keep getting emails but I had to search the web for a contact nr and email to query last week Monday. This is apart from the email I sent on the 6th of January to say the office is open and they can deliver here. I keep getting email to say action required with a WhatsApp nr, which I've tried 3 or 4 times with no luck. There is no customer service, no contact number and no email address. My email from last week after searching the web for contact details got a response of is it a complex or house...ridiculous - the driver was here before - not problem - it's the easiest address, why waste my time Liz! I then phoned last week and was told that it'll be escalated - now 4 days later...not a word and no package. DID YOU LOSE MY PACKAGE?