Telkom non existent services

Have been trying to have our landline sorted out since November and have numerous reference numbers and still no response. We have stressed over and over again that the problem is not at home as the line has been tested. Now they say we must pay R900 for the account, really for something that does not work. Nobody is even trying to help and my husband is Emergency Services and needs the phone but falls on deaf ears. From ********** 830.