My $900 US checking account was blackballed by TeleCheck, when I made a small online purchase at Amazon, designating that checking account; so I had to change payment to MasterCard. When I called TeleCheck's 1-800 number, I was taken to a voice-mail jail, where among many other things, the robot voice wanted the "check number" -- but I hadn't written a check!
So I gave up.
Minor inconvenience, but I want to be able to use that checking account for online purhases. TeleCheck should have provided details as to what the problem was, in their estimation, and an email address.