More expensive for new contract than upgrade

I am shocked. I have been a Vodacom contract holder since 1999 with the same cellphone number. My contract expired in April 2025. So I am very clearly able to change my contract package. I went online and there is a deal for R229 pm for 24 months for 3GB and 100min (top up). Sounds great and on the website it says new line or upgrade. I select upgrade and it says I need to contact the call centre. As I do and I request the same deal and am informed I have to pay R309pm for 24 months and this deal is only available for new lines. So effectively Vodacom you are telling me, that you would prefer me to cancel my contract and port my number and take out a new contract which is administratively expensive for you. I am blown away. When I mentioned this to the call centre agent, she said she can transfer me to cancellation.