Inappropriate deceit

I have set a limit previously on my Vodacom contract. And have come to know I have been deceived. This month with a huge bill that got debited and in querying it apparently nothing is reflecting on the Vodacom system as they claimed. Upon calling them again. As they cannot be trusted as this is evident. They talk right and walk left. How can one say Vodacom is effective n efficient. Been a loyal customer with them over 20years. Now determined to cancel all my contracts as nothing is recorded. Vodacom is too big to serve all, that's why small clients like myself get taken for a ride.