Greedy Vodacom has me paying too much!

I took out a 30Gig anytime Vodacom LTE contract in June 2019 for R549.00 per month. Contract period: 24 months. But in September 2019, Vodacom Fibre calls me and offers me a much better deal: 10Mb/s Uncapped Fibre for R699.00, on a month to month basis (no contract), free installation and free fibre router. So I definitely wanted to go for that, and wanted to cancel my LTE contract. I contacted Vodacom On-line, but was quoted the full remainder of the contract of almost R11 000.00 as cancellation. This makes no sense. And the service would fall away as well. At the same time, Vodacom is now offering a 50Gig Anytime data contract for R349.00 per month. This is a massive drop in data pricing in just 2 months, but I'm locked into a 24 moth contract at the ripoff price of R549.00 for 30Gig. I'm getting less data, for more money and there is no cancellation fee - only the full remainder of the contract price. This is totally not fair! Thanks Vodacom.