Vodacom please stop being *****s

Vodacom is being so ridiculous is unbelievable.my wife's contract came to a end in Jan this month but she keeps getting bills everytime we go to the store or phone they say it will be the last payment now I think it time to get lawyers involved they can't be robbing people to pay for contracts that has been over for months times are hard people don't have money to throw away ....I also cancelled my contract with Vodacom and I will never ever take anouther contract with them on how they are robbing the people