Bad customer service and monthly followup because vodacom doesn't do their job

I phone vodacom in December to cancel my contract and met a nice gentleman who made me to change my mind and retained me as a client yet the same thing keep on happening of my data airtime not reflecting on time and me having to buy and I have contract in place. I call vodacom every month to fix their errors I am tired of vodacom you are really wasting my time. I called yesterday because my data is no loaded and my airtime disappeared. This is really not on I have been a loyal customer for more than 20years and the service just jeep on deteriorating.The lady I spoke to yesterday said my data will be loaded in an hour I'm still waiting. Can I please get this sorted and I'm not going to pay anything extra, if this is not done by tomorrow I am canceling my contract with immediate effect. I can't continue with this bad service every month No.