When submitting a case the confirmation email doesn't come through nor is it in the junk folder.

So remember to take a note of the case number when you see it on the last page like this

Thank you, we’ll be in touch soon

Your case number is xxxxx

A confirmation email has been sent to xxx, it may take a few minutes to receive it. If you can’t see it in your inbox, have a look in your junk mail.
We take care to investigate every issue thoroughly and will get back to you as soon as possible.