Cancelation of contract

My circumstances change and I want to cancel my contract, what I did and they say it will be prepaid in 24to48 hours. Call them on Saterday and now I must here that they **** to me. It will only be on the last day of the month. Not even CellC do it that way. This is pathetic. AND the lady say I won't pay anything on the end of the month becuse I paid 1st Jan. Callcentre say NO NO there will be a deduction at the end of Jan. Really do the people at cancellation department know what they doing? Because of them I change all my airtime to data so that I can't at least loose the use for what I already paid for and now, now I must hear no all will happen only on the last day of Jan. I really hope you not the same as Telkom to keep me struggle with a cancellation.