Telkom charging for a service i cannot use.

I have been reporting my line since October 2019. Speed drops and the dsl not working correctly. Every time i get a sms the issue is repaired but a technician never shows up at my house to repair. Then i get a lame excuse the lines are old and since last year october im paying for a service i cannot use 2/3 of the month. Asked for a manager to contact me but nothing happens. Who can i contact.