Unresolved / Non response of Cancellation of ADT Contract

On 17 April, I called to provide notice of cancellation. After several calls, I then proceeded to send an email and finally managed to speak to someone who advised that they would respond to the email. She was not clear on the cancellation period—whether it was a calendar month or 20 business days, as stated in the contract. She agreed with the information I had referenced from the contract and advised that she would respond via email. On 22 April, we received a message requesting that the cancellation notice be sent through, which we did. Again, on Wednesday, 29 April, we received another message requesting the same, and we resent the notice. To date, there have been no calls or further communication regarding the cancellation of the ADT contract. I do not believe I should be charged for May for services that are no longer being provided. The radio is already disconnected and still needs to be collected. I cannot continue calling only to be told that someone will respond to an email. It has now been more than three weeks since the first email was sent, and it has still not been responded to. Your keep on asking the reason for cancelling when I called in , yet your offer this type of lack of service.