Vodacom Upped contract amount by R200, without any notification!!!

After having experienced issues with Vodacom's LTE signal (LTE package) - I kept my contract going for the allocated period. I was just notified that after the initial contract date came to an end, the contract was extended, but the cost of R499 was upped to R700?!! They also did not notify me that the contract expiry date had arrived - so I could cancel. SORT THIS OUT!!