Non existent customer service . Poor update system . Paid Vat & Duty Twice now !!

I have paid import vat and Duty twice now because they keep saying I have not paid. No one answers the phone, no one replies to emails, if you do the live chat where they say they reply immediately they don't and when they do they not helpful then close the chat. I was told payment would be allocated and to allow for 2 days and today I'm still getting emails that it's unpaid . This is ridiculous now and the fact that you can't even get hold of anyone to have a proper conversation is beyond frustrating ! The worst service I have recieved to Date . I have even uploaded proof of payment FIVE times. What is going on !!