No service after 6 days and many phone calls

After 6 days and 20 or more phone calls we have still not had our adsl line repaired. Not just that but a few times we have actually had a call centre agent put the phone down despite us not being rude or unpleasant. What is a customer to do? We are not permitted to speak to a supervisor or manager. Not just that but they phoned twice asking if our landline is working.