Make sure you message them now declaring that you don't want a full contract and would like to end the trial. If you signed any documents agreeing to the trial you'll probably find that there was a clause in the contract saying that unless you specifically contact them before the trial ends expressing your interest in discontinuing, that you are now bound to them for the year's contract. BBTV = Broadband TV and they're notorious for doing this and roping people into longer and longer contracts.
If it turns out you are stuck with a 1 year contract, then honestly with a channel that's small still your best bet might simply be to close down the channel and start a new one. It might sound rough since a lot of work has been lost but you can still re-upload the videos there, and you can redirect your subs to your new channel too. Rebuilding will be a lot quicker than the initial start was.
Generally if you're wondering whether you should join a network or not the answer is a big NO there are only a few select times when it'll be in your interests to join a network, and even those times it's kind of hit and miss and not really a guaranteed good decision. MCNs aren't there to help you find your subs, they usually just offer the occasional tip or a few tools and that's it - all at a cost of a significant chunk of your revenue. All MCNs are not created equal, and some offer an okay deal if you're particularly set on using one of their tools, but others really offer very little and pretty much get all their membership from messaging new YouTubers who get starstruck by the idea of working with an MCN and think they're somehow special (not realising that the bigger MCNs like BBTV invite thousands of channels with < 100 subs every day in the hope of catching them early before they know any better).
Tl;dr: Message the MCN directly saying you are uninterested in continuing the trial and you would like to cancel. (Don't just cancel in your YouTube settings - you have to also message them about it and explicitly tell them that you are not continuing the trial) If that doesn't work and you've already signed a contract, start a fresh account, yes it'll take a few weeks to get your progress back, but it's better than 1+ years of crap from being a part of an MCN you don't like.
