Horrible experience

Contacted an agent on live chat to have my address changed nearly 2 months ago and was promised it was done. Received the second invoice STILL incorrect. Emailed the support email and got a response 1 week later to email a different email address. 1 week later I get a response from that to call a number that won’t even go through! How can it be such a nightmare to do a simple address change when the incorrect address was a fault on their side from the start!