Harassment

Good day I am receiving calls from ADT company every hour and harrasing me over an outstanding account which i dont even know how did it come about. I am now going to take this matter further legally since the calls won't stop, cause im getting very much annoyed by this whole unresolved issue. Im not the one who made the mess and not do my work but comes from their side. I expect no call from them furthermore until they comes to terms with their incompetence. Regards, Modiegi