you accepted a contract term agreeing that you would be charged a £35 fee for cancellation prior to activation. Even then I think you're on strong ground - the contract mustn't contain any clauses that limits your rights in law.
Huawei P10 review
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.