I'm very surprised, it was over 3 months ago that I cancelled my licence. I had an initial contact where they had completely ignored my wish to cancel and sent me a letter to set up direct debit. I sent them an email reply being very blunt so I assume they got the message.
Since that I have heard nothing further from them, I guess they could have been around looking for me but they would be lucky to find me at home. A number of years ago when I didn't have a TV licence the letters arrived at least one a week. Then again I guess the threatening letters could start any day soon.