Vodacom extending 8 months on contract and haven't resolved the issue since 2019 up until now when contract is only 2 months from Finished payed.

In 2017 August I got an account at vodacom 2 year(24 months) in 2019 April I upgraded with a 3 year (36 months) contract. I had to pay the old contract of 4 months aswell as the new upgrade. Their system shows my contract is only ending in 2023 January I have been trying to get this sortwd out since 2019 And I have had no success they sent me the complete payment history from 2017 up until the date requested which was December they then sent me the supposedly QUOTE with all the dates on of the first contract the amount of months already finished the months of the new upgrade with the end date already as January 2023 I continued to show them that this obviously is wrong they then sent me msgs saying its because I was behind on payments end 2019 beginning of 2020 But on the statement it clearly shows these payments were paid up and I also informed them that the supposedly quote they sent me already had the 2023 January date on which means if the late payments were the reason then that date wouldn't be br on the quote of the upgrade or it is ***** and the person who assisted me December online were the one to edit the dates. This is 8 months longer than it should be and I refuse to pay 8 months more it is almost R6000. The 3 year contract awe to finishing End May I want to finish paying it abd close it but I am having absolutely no help. They stick to their thing saying they extended it due to missed payments and I will not accept it because all missed payments were paid up to date back then to have the account activated again.