ADSL LINE NOT WORKING SINCE BEING INSTALLED

Ever since installing my modem (ADSL) the internet has never reached beyond 1 meg, and this is supposed to be a 4 meg line. I have logged numerous faults (latest fault ***), when calling Telkom I am always promised that a technician will be at my office the same day to no avail. When a technician finally pitched up, he promised me my line was fixed (he has been here twice, after having to wait for 5 days after logging the fault). After being put on hold for 20 minutes my calls are just ended by the call centre. According to one call centre lady a technician has bee dispatched to my office, less than ten minutes later upon speaking to another call centre lady,I hear that no technician has been dispatched. When asking to speak to a supervisor or manager I am first put on hold and then get the line dropped and later when phoning again I am informed that the supervisor or manager has already left for the day! This is so pathetic!!!! I am literally on the point where I am going to take my router and throw it through the office build window of the closest telkom building I can find!!!!!