No internet access for a month

We have an adsl line through Telkom and are DISGUSTED with their service! We have had no/ intermittent internet access since early November. We have phoned many, many, many times and are told a different story each time . We were originally told, after many hours spent on the phone, that it was our modem so we replaced it at R1000. Surprise....it still doesn't work! Then we're told there's a fault on the line and we lodged a complaint. We did this several times before finally receiving an SMS saying our line has been restored. Well, it hasn't been! We have spoken to supervisors 3 times who either promise to call back or cut us off. We are at our wits end! We are charged for a full month's internet access but have had none. We are extremely dissatisfied customers and need this rectified ASAP!