Vodacom bad service and incorrect information given to client

I called Vodacom cancellations on the 5/5/2020 and spoke with a gentleman and requested to cancel my current Data contract Which is finished in half a month on a normal day without having to work at home (I do not have a device with this just monthly data which amounts to roughly R267 plus vat equals roughly R305 each month. Due to covid 19 and lockdown I have had to get a uncapped WiFi deal at R480 so that I can work from home and earn an income. Vodacom could not match that deal so I respectfully requested to cancel the same. The cancellations consultant a male (was not clear with his name) firstly gave me every excuse to cancel , thereafter he told me it will be roughly R9000 payment due to cancel this contract. I questioned this as I only have 15 months left on the contract which would end August 2021. So effectively the total installments add up to R4600 including vat for the remainder and 75% of that is Roughly R3400 including vat. Per Vodacom consultants the cancellation policy is 75% of the remaining period. How is it that the consultant who claimed the system generated the amount wanted R9000. Lastly while talking I was asking to speak with a manager and still disputing this , the cancellations consultant ended the call. I refuse to pay R9000 to cancel a contract I will not be able to upkeep with the current situation (covid 19).