MTN ******** me

MTN is not canceling my three contracts after I have settled the account. I contacted them and Spoke several times using my airtime from other servers providers since they blocked my SIM cards. The consultants put the phone on mute and their email system does not work. I am carrying fees over and I need the contracts to be canceled and for the month of December. I do not want to in-curry any new month fees as I have no service that I am using from MTN.