Telkom faulty line and internet for 2 years

Hi. For the past 2 yrs I've been reporting a faulty line and internet. I been in contact will the call centre and they told me that I must keep on paying my account and they will refund me when the line gets fixed but ever since no technician has ever came to my house to fix it. I decided to stop paying for 2 months and only to find out that they've listed me on credit bureau. This is not fair and acceptable. Why should I pay for something that does not work and gets listed for it. I'm really not happy about it????☹