Land line not working.

Been a fixed line customer for more than 30 years and migrated to adsl about 9 years ago. I have has numerous issues with my adsl line speed and about a mont ago my adsl was giving me under 2 mb line speed on a 4 meg line. They found a problem on the exchange and fixed after 2 weeks. Since the line speed was resolved, my landline has not been working and I cannot get a resolution to this problem. I get put from pillar to post when I do call them. I just need a senior customer service person from Telkom to call me ASAP.