Teljoy is complacent with updating clients credit records

Teljoy has indicated to the credit bureau that my account is in arears this is not true, I have proof that I have paid my account and Teljoy still after countless phone calls to rectify the error has still not fixed it. Even though Teljoy has confirmed my account is up to date and not in arrears. My credit score is being impacted and Teljoy is not doing anything about it. Please correct my account URGENTLY!! with Experian and Transunion ITC as their reports are all saying I am in arrears.