Worst service

I ordered global items from Zando. I was shortly after that contacted by an agent who said it best to reduce the amount spent on global orders. He cancelled an item I had already purchased. However, I had used a voucher on my total spend. He did not realise this and said he would escalate to the team to provide a new voucher do I can order the items removed again. He also advised that shipping would not be charged. This was a week ago and still no word. I have followed up in 4 emails with zero responses and zero action.