yello data deducted after cancellation

<p>Mtn Yello data department is do *********l. They sold the product to me in august for R59. End of august they deducted an amount of R456. i was told that i used more data then prescribed. I have cancelled the yellodata end of August beginning september 2016 and the yello data started deducting again. According to them it was never cancelled, but there was no deduction in October, only now in november on the 14th . Phone in today and spoke to Michelle with ref nrYD- ********** 1-1 as they deducted the R464 which is my petrol money. No sms has received that they will deduct the money today. I have never since cancellatoin switch my settings from MTN to yello data and I cannot understand how i can use the yello data without switching. I have received poor horrible service from the yello data (MTN) department. They refuse to refuse the amount that they have deducted.</p>