Vodacom increased premiums within my 2 year signed contract without my consent

I renewed my contract with Vodacom in April 2021. Signed the contract for a 2 year term to pay monthly premiums of R339. In April 2022, my premiums increased to R362 with no notification from Vodacom. When I went into the store at N1 City, Goodwood and asked about this premium increase, I was told that it was increased due to Covid? Seriously? If I signed a contract for a 2 year term for R339, how can they just increase my premiums without my consent or signing another contract and just deduct R362 from my account. I want my premiums to revert back to R339 as per my signed contract and I want a refund of the increased premium difference from April 2022 to current date.

I signed a contract for 2 years to pay R339 - It does not give Vodacom the right to just increase the premiums whenever they feel like it and deduct the increased premiums without my consent. That is just ******* !!!!!