In my dealings with them, their own laws. However, this is the contract I agreed to with Toggle Mobile and this is what, afaiac they are in breach of:

Please check our website regularly for any changes. Changes to Charges will be reflected in our tariff table from time-to-time. If a change will be materially detrimental to you, Lycamobile will give you at least one month’s notice. If you do not accept a change which is notified to you as materially detrimental then you can cancel this Agreement or cease using the Services or topping-up your Account. If you use the Services or top-up your Account after Lycamobile makes a change, then you are deemed to accept the change.

So, called my MasterCard provider, said I want to start a chargeback for non-delivery of service and that is the path I am going down as of last week. This is my barrack room lawyer opinion of a) not having received any notifcation b) it is materially detrimental to me. This was after having been on the phone with Lycamobile who told me that there is no facility to refund money. I gave up at that point, mostly because they transferred me to a supervisor and the line went dead. So I only intend to go down the chargeback route with MC.

As for leave Lyca that means to another provider and I would be more amazed than someone that is very amazed indeed if you get a sniff of a refund.