Consumers forced to pay for companies providing clients with the incorrect information.

On the 28/09/2018, i requested a early cancellation of my contract, i was given a quote and paid it, today i received a statement stating that i still owe vodacom R241, y was this amount not included inthe qoute? So i must now pay for vodacom giving me the client incorrect information. This is extremely poor service on the part of vodacom, and when you try and call the accounts department of the company no one answers the call. Y must we consumers pay for the companies mistakes.