Justin.tv Pro accounts apply to Justin.tv only. Until recently, there was some cross-over of benefits from Justin.tv to Twitch. However, that is no longer the case as Twitch & JTV are now separate sites. 

On Twitch, you can purchase individual channel subscriptions or event passes when available for ad free viewing. These options directly support the broadcasters on Twitch.

If the JTV ProAccount was not what you thought it was, you can cancel your subscription by doing the following:

1. Log into your Twitch account.
2. Go to http://www.justin.tv/settings/purchases/.
3. Click Cancel Subscription.