Why am I 'contracted'?

[#1]

In 'my accounts' I notice that my package is "unlimited contracted", even though my 12 month contract finished in March or thereabouts.  I believe I am now on a one month rolling contract. I'm about to contact PN regards an upgrade, to fibre, and don't believe I am tied to a contract now.
Have I misunderstood this? 

[#2]

The critical part is this
What does it say about "On cancellation"
If you are out of contract it would say
£0 (upon cancellation)

[#3]

Thanks OJ, Where would I find 'on cancellation'?  Been looking, and can't find it.

[#4]

https://portal.plus.net/my.html?s=0&action=account_summary

[#5]

thanks, got it. Spoken to someone at PN. Lots to think about. 
I'm not known for being impetuous!