So I was trawling through the log files here at work today and I noticed some more wvproxy.com URLs coming through to one of our customers. So I picked up the phone and called them.
It turns out that they have a Yellow Pages listing and have an alternate phone number to call on their yellow pages site. But strangely the number on the yellow pages site is NOT the same as the one that wvproxy.com returns.
The number on the wvproxy.com site does go through to the client though.