Failure to cancell my contract

<p>Good day</p> <p> </p> <p>my name is salome and i have requested for my contract to be cancelled by july 2016 at the vodashop in detoit and they told me that i need to contact ********** i did so nd i was told it will be cancelled by the end of july but im suprised that today im receiving allocations and when i call through they tell me to pay again and they will cancell it but what guarantee do i have they wont repeat the same mistake again for not cancelling pleae cancell the contract with immediate effect as i have given my 30 days notice period.contact details ********** 637</p> <p> </p> <p>regards</p> <p>salome</p>