Business account having difficulty adding a new end point - only 8 allowed?

I have recently purchased TeamViewer Business for 1 user and yesterday I tried to add a new computer.  Before trying this I had 8 computers in my list.  The message I got when trying to add the new one was that I had reached the maximum number of permitted devices for my account, and I must log on and remove one to continue!  This I then did, and then it would let me add the new device.  However I am now wondering what I have paid for.  I thought that there was a limit of 200 devices, not just 8.  Can someone please advise me?