Opco 365 (LTD) ****

Hello Peter, I've just recently discovered I've been blacklisted .This company appears on my credit report it's called Opco 365 (Ltd) I don't even know them apparently I've opened an account with them in 2014 March .I started working 2014 September so how could I have opened whatever account with them when I was unemployed .They are stating I'm owing an amount of R902 for what ,I don't even know what business this company is running.Please help me ,they are ruining my credit record.I cnt even buy a car,I'm blacklisted because of them.