I did. I had a call 2-3 hours later asking me to try a test account.
Said test account has *all* incoming firewalled, so it was no use whatsoever (other than proving my point that they can and are doing so).
Despite repeated nagging, it will be 7 days on Monday (eg when the "networks" team who aren't there/don't work beyond 9-5, M-F apparently, despite the 24/7 support claims...) and there'll have been no resolve.
I've wasted many hours on this, and I've ended up paying to expedite activation of another line to work around this issue - at my expense of course and certainly not with those buffoons, just because they're incapable.