Cancellation of uncapped home WiFi

Vodacom I signed the uncapped home wifi on 19 December 22 and by 11 January communication of changing to capped was done on sms not on documents. I called and requested the contract cancellation since Vodacom is changing the terms to what I didn't sign for. Consultants keep telling me to wait & downplaying the cancellation process. On media they said customers can cancel the contract with no charges but the process is now a milestone with consultants not helping me on the cancellation process. This home wifi router is not helping if capped, I request Vodacom to communicate the cancellation process and take back their home router as defaulting suppliers . Calling their consultants you wait in que for 30 minutes only to be dropped by a consultant telling you she doesn't hear you at all. This is so unprofessional... please give customers all details for cancellation of these contracts that Vodacom is negating on.