POOR SERVICE FOR CANCELLATION OF DEBIT ORDER

I am extremely angry with the service that i have received from CELL C for the past 3 months i have been calling trying to cancel my contract but the call centre agents are making my life miserable and hard , i cancelled my contract in June or july don't remember the exact date correctly and when i called the lady that i spoke with told me that she will cancell the contract.She told me about the data deal that CEll c have and it is only for 3 months it will end in November and told me that it will only cost 89 and if i don't find it exciting during the trial i can call and cancel it anytime.but Now in September my bill exceeded 89 x4 and i called to enquire and wanted to cancel the contract they gave me stories i ended up ignoring the matter.So after that i wanted to see if i am going to be ********** i didn't use the cell c simcard for the whole month and to my surprise the october bill came to One hundred and somenthing when i call today to ask why is that possible they are telling me that i have used mms and i don't know how cause i never used the simcard this month.I asked them to cancel this trial so that it must stop debiting on my account and the consultants are giving me an attitude and they are telling me that my last debit will be on December and how is that possible cause i cancelled my contract with you guys and now i was only on trial with the new data deal for 3 months and now you guys want to debit for december i am told that i am on a month to month contract which is not true cause icancelled that long time ago i am really not impressed with the service that i received from both the two consultants and they threatened me a customer. I am really angry and not happy with how they both handled the matter to be threaned and being told that they don't care and won't cancel my contract as i have instructed and that he will hangup and i can call again someone that will assist me as he won't do that it is highly disrespectful that i am frustrated as a customer and the call centre is giving me an attitude.