Cancelled contract But still paying.

On the 16th July I cancelled two numbers that had finished there contracts. The top ups were meant to go to Prepaid. One of them went to prepaid. ***. The other one they did not cancell and I only found out when I got an sms to say they were going to bill me again the following month. I then tried to call the call centre three times and the line keeps on getting dropped. What is happening. I cannot even call for them to pull the tape and see that I wanted both numbers cancelled. The number that still needs to be cancelled is ***. My account is ****** My contact number to confirm that you have sorted this out is ***. Please can you see that this is done so I dont pay for another month.