Horrible Vodacom service

I m not happy about vodacom service..I once have a cell phone contract with them the number is ***,the contract comes to an end I paid and phone to cancel the benefit because I was no longer interest in the contract as it was 2 years and two years was over..The cease sending data and airtime, now they started to send data and airtime.I went to the shop to make them aware that I do hve a contract with the number *** not *** they must stop sending airtime and data to ***..They stopped for few month now as I m writing they resume sending data and airtime to *** and demand payment I no longer use the phone I gave it to my daughter who told me they send her data and airtime..Now they send me a bill..Assist plz