yes..this was happening with clickbank.sales consistency was missing for last few days.But now sales are again rocking
Banners usually never work for me (even the really, really hot ones). If you have a blog, I recommend writing reviews and/or include text links within your blog posts of the affiliate product you're promoting.
That is a bit cheeky from the vendor. It's one of the reasons I have an email newsletter for my affiliates so I can notify them if anything like that ever happens. I'd get in touch with the vendor as well as Clickbank (since CB haven't technically done anything wrong, and there is little they can do to stop this situation from happening).