RMCS please cancel the contract I'm said to have with you.

I received R55 airtime for the third or forth time now. when i called vodacom, they said i got it from RMCS. RMCS even changed my number from prepaid to contract. I do not have a contract with Edgars or Jet.. I've been calling ( ********** ) since 22 June 2018 but they are not helping me. they gave me reference numbers ( ********** 622792, ********** 633018, ********** 642563) and they said they will call me within 24 hours , i do not receive any calls. what do i have to do to cancel this?