Vodacom system

I have been having a contract with Vodacom since 2017 …Last year April took an iPhone 12 wanted also the watch but it was out of stock . December 2021 revisited Vodacom to get a trade in and add an accessory to my account .I was told that my contract is on the old system and no one knows how to use the system anymore . Why can’t they transfer my contract to the new system so that they can assist me . Called cancellation department to see if I can’t pay it off early ,guess what I also have to pay for the airtime that I haven’t used as yet Ai Vodacom.