Data breach and billing service failure

Poor service , have a contract for 2 years but since inception they have added some Shayan Modi to my contract from time to time my details changed i noticed the account number differs with one digit. I been instore to rectify it but they still calling me and sending me emails for Shayan Modi. His name is on my account . I did an contract online and that was also stuffed up . my banking details was not added my email address and info not added yet i was approved for the contract but with what info if the systems info shows a other banking account number etc. No one can provide clear answers . Was instore twice to sort it out still not rectified. Contemplating closing this contract that's due for upgrade ,previous contract also had issue I closed account had all the evidence and was still billed no one cared to fix it so I paid in the R1000 just not to get blacklisted this company is like the mafia they don't care about they clients . Even with evidence of their error they don't admit to the error and fix it. I also just got an email for Shayan modi about arrears on his account and i get emails from NUDEBT a final notice for an up to date account. Sent 3 emails in total now to all telkom and Nudebt.