ADSL Line not working for 4 months

good day I am so frustrated with Telkom - our internet at home has not been working for 4 months - we have had technicians at our home - they close the case - passwords are changed - but it is still not working - I would like to cancel my ADSL line with telkom - as i have had nothing but terrible service from them - I have tried their chat line - I need this to be sorted out as we are paying for service we do not have.