MY CANCELLATION WAS NOT PROCESSED!

I called the customer care line to cancel 1 of my contract numbers and move to prepaid. I also requested cancellation of my 3G line. Upon being asked a million questions as to why I want to cancel, the operator said my cancellation will be processed and I would be on prepaid from 1st July 2018. Today is 2nd July and I received my monthly contract allocation of 4Gb and 50min!!!!!!! I did not even receive an sms to confirm my cancellation as promised on the phone. I want this sorted out ASAP as you wont get your money at the end of this month for this bill. AND futhermore you need an email for cancellations as your call centre is so useless. Now there is no record i have except for my phone call on 26th June 2018.