ADT, Stop this Customer Abuse

On the 1st September I wrote a complain about ADT, they promised to call me. Today is the 15 September, still no call. ADT is continuing sending me payment demands. I have called, sent all proof to ADT, I do not owe ADT a cent. I paid in 2021,cancelled contract in 2021. ADT stop abusing me, my name. I am a pensioner, this is affecting my health.