Vodacom contract dept is a **** in SA

Am Rachel i had a contract of Vodacom home router gadget Acatel. It was not working since Feb 2024. I returned it and they gave me another router isnot working. I posted on this platform as Vodacom had blocked me on 082 135 and 1958.Last on the 19th April i got a call from Vodacom. After expressing my frustation the gentleman who was assisting was very rude. He told me yes the replacement wasnot new it was repaired after some1 returned it. If you cant repair what i returned you were supposed to replace with new gadget not damaged from some1 house. I hate secondhand in my life. He said if you dont want a second his wasting his time. I told him cancel contract because you are not ready to render the service. I learned on the 22nd April they cancelled with fine of R30,000. My question who was to be fined for bridge of contract between the Vodacom and myself. Am not a law student but they are the ones who bridge the contract by failing to render the service, repair or replace their router as it was not working and i was paying them.