I also have this problem and none of the usual suggestions worked. I opened a ticket but have not gotten a response yet, it's been almost 24 hours, hopefully they wont misread it.
I wish there was some indication of how stressed their support system is, it's obviously bad given they had to shut down the trollbox, but still.
That's at least 5 of us now by my count. Hopefully it becoming more widespread will make them address it sooner. As noted above I started a thread just for this issue that I'll post any updates in.
Mine just allowed me to cancel. Never got a response on the ticket but glad it works now. Hope the same for everyone else.