account query

my contract FOR *** expired on the 28/09/2015 and i contacted mtn that i am not going to upgrade/renew my contract on the 03/09/2015, i was given Ref: and promised i will be contacted by call centre agent within 5 working days to cancel, end of september they deducted money from my bank without even contacting me and called the call centre beginning of October i promised that within 5 days it will be cancelled and i must make sure i don't have airtime on my phone because i will forfate it, mid october i called again i was asked to confirm my details as usual and promised they will come back to confirm cancellation to my surprise the 30/10/2015 money was deducted again and when i contacted the call center with my ref. number they send me email to confirm my details again of which i don't have energy for that, they don't know what they are doing but i am going to my bank to reverse my money if they don't reverse it before 04/11/2015. i have a contract with vodacom and i want to Switch my number to voda so you waisting my time with your pathetic service, YOUR SERVICE IS THE REASON WHY I QUIT TO VODACOM.