account closure nightmare

I settled my account on the 5th of November last year and requested that the account be closed. I cancelled any funeral cover as well club subscriptions going off my account to ensure no additional charges. I followed in January this year and consultants confirmed that my account has been successfully closed. this morning on my credit report i see i am off track for missing a Jet payment of R60. what makes matters worse is when i phoned to enquire automated voice tells me my account is handled by a different provider and i should phone *** number. but they cannot pick up any account from my ID number. I don't understand what games you are paying but you are messing with livelihood here, please fix your mess, I don't owe anything.