Wrong billing

About three years ago I had a telkom adsl line to play online games. After having trouble for several MONTHS with the line and numerous complaints via calling and going in store the line was fixed after 4 to 5 months. I used mweb for my cap and when the my ping spiked and wasn't fixed i contacted mweb and they assured me the problem was telkom. I went to telkom and the said they have problems in the suburb. During this time I clouldn't use my internet because my ping was insanely high. I told telkom i'm not going to pay for the months i couldn't use my internet because why must i pay for a service that im not getting. They said it's fine and will correct my bill and subtract the months i couldn't use internet. Surprise, surprise my bill wasn't fixed after they fixed the line after atleast 4 MONTHS!! I told them they must correct my bill and not going to pay if my bill isn't fixed. The guy that worked at telkom lost his temper and told me it's my ****ing problem..... so they stopped service because i was not paying my bill because they haven't corrected it yet. I went back to telkom and explained everything again. They told me i can't close the line until it's not paid. Almost 3 years later telkom attorneys is calling me for the outastanding amount. After 3 calls and expalining to them what happend nothing was done?????