The link that I posted absolutely is valid.
http: // www. blackberryapps. com/platformMain.asp?sString=call%20block&deviceid=106 4&nds=1&platform=5
Or just search in the app store yourself for "call blocker". That's what the link points to.
As to the support issue, have you tried contacting the app developer directly?
Have you tried the Support page? http://www.blackberryapps.com/support.asp