Just how long does it take to cancel a contract

on 27.03.15 I contacted the Cell C help-line as to why my data contract is still running even though I requested that to be cancelled together with my 2 other phone contracts in December last year. I was given a *** as a reference number & assured that someone will call me after they had listened to recordings of the earlier calls & told that monies will be refunded. I had already informed them due to the fact that I have to return handsets, I will not be cancelling the phone contracts. However on 16.11 a Cell-c rep called me & spoke to me about returning handsets. I informed her that the nature of my query was in connection with my data contract & not the 2 phone contracts. Later I spoke to Adrian who also assured me that someone will call me after listening to earlier recordings. That also did not happen. Today I spoke to Ayanda & Akiel. In both cases I requested to speak to supervisors which did not happen. Ayanda had me on hold for more than half of our 27 minute call before rudely ending the call. Akiel again referred me to my phone contracts & also told me that the reference number was for a network issue & not a cancellation query. No-one wants to take responsibility