Very bad customer service!

Ordered something, then immediately realised delivery address was very old address but no way of changing it on their website. Immediately contacted them by email & phone, followed their instructions to change address after eventually speaking to call centre person. Since then no response to multiple emails to confirm correct delivery address, item despatched to incorrect address. Have spoken to at least 7 people since then, some quite rude...long story short: more than a month later still no delivery, nor return of my money as requested. They also refuse to give you contact details of a manager who can actually resolve your problem. They clearly have my updated address now as they annoyingly keep sending me their catalogues, but can’t be bothered to resolve my issue.