Vodacom blacklists me

I recently found out that vodacom blacklisted me without contacting me or notifying me of an account they claim i have. I attempted to contact them but got a very rude consultant who refuse to assist me. I have emailed them and got no response. I would like to sort this matter out but not getting anywhere with vodacom. I would appreciate if i could get help in getting information on the said account and proof that i have taken out the contract as im disputing any knowledge of the account.