ADT Complaint

I signed contract on 04/10/2019 on 04/11/2019 I sent cancellation request. ADT Called me and negotiated with me to lower the bill and send me visa cards $500 which none happend. On 05/22/2019 I signed new contract with ADT and on 05/23/2019 I sent cancellation request to ADT. Till now the keep charging my account and they refusing to cancel the service I called them 10s times.