RSAWEB greed and pathetic customer service

Greedy!! I called a day late, 2 December, a matter of 9 hours late, to cancel my contract for end December a d they completely refused. Saying I am a day late and will now have to pay for January as well. I explained I am moving I. December but they wouldn't hear anything satting only their T&Cs. Surely one day late will not break their business or bank account. It's seems very greedy and lack of any proper customer service