Land line and ADSL dropping for the pass 3 months

I have raised numerous faults with the call centre on account of my land line and adsl dropping connection. It happens every time its windy. Which is often in Durbanville Cape Town. The technicians have checked the modem and the exchange and say everything is fine but are too lazy to check the line between the exchange and my home. I am paying for a service that I'm not fully receiving. As I work from home this is not an ideal situation. Today my line has been down for the pass 4 hrs. Please someone help!!!!