Engineer No Show and willing to Cancel the Contract

[#1]

Hi,
I've been on Plusnet over the past year and everything gone ok...
On 15th of July i've requested to move the service to my new home address..
on 22 th i received the mail from Plusnet about the new contract condition and i was in doubt if cancel my " moving " and leave plusnet or not since i don't like the new conditions...
anyway i decided to go ahead and have  atry.
They first book me an appointment with the engineer for 22th of June, then they cancelled it just 3 hours before.
Then they fix a new appointment for Today, 10th of august.
I took another time half day off from work and NO BODY show...
Now i' really upset and want to cancel my order.
do you know if i will have panlty fees?
i think that i can cancel anyway, also if is a new contract, if i'm before the 30 days from receiving the mail about the new costs?
Thanks for help

[#2]

Hi sighthound1,
The engineer's notes haven't come through yet. I'm leaving this comment as a placeholder, and I'll check up again later for you to see what's happened.
Matty

[#3]

Thanks,
could you please also confirm that if i want, due to the change of products, i can leave and cancel the contract at no penalty costs?