PAYMENT FOR NON EXISTING SERVICE

Vodacom still forcefully wanting to debit my account for a service I am not receiving from them . I have laid several complains that the fibre is not working . Its over 3 months now , last month a consultant called saying the debit order did not go through , when I told her that the fibre hasn’t been working and I have been reporting without getting any help they said they will send someone. No one was sent , now they are sending me Outstanding Account Warning Letter for what exactly ? What am I paying for ?