contract cancellation with vodacom - ridiculous

I have a data contract that i do need anymore because i do not afford it. The contract is 10G for about R140pm and it does not come with any device. I was given a quote of R5175 just to cancel it. i have had the contract for about 4 months only. I am being charge for data that i will not be getting. This does not make sense at all its a reep-off and unfair business practice. From my experience most companies only charge admin fee for early cancellation of a contract and maybe add the remaining amount for the device not what i being expected to pay.