Disappointed in Mweb

I signed a 12month 100meg fibre contract with Mweb because we work from home and need the WIFI But every time the power goes off and comes back on again I loose the WIFI and have to reconnect via another computer to reset the modem. And if this happen after hours I must wait because Mweb don't have an after hour service. Or if I'm not at home my wife cant work until I'm back to reset it. I wish they will tell you this when applying for the WIFI line . How do i cancel the contract to go back to Vodacom ??? Never had issues with Vodacom.