Being charged Fees while there fees in my account

I both contracts phone on the 20 jan 2018 n my pay day its 25 each month R229 but on 25 was billed R97 n after two days received sms that R293 bounce back on my account n immediately i called and ask y it didnt debit they never know what hppnd n due to that dounce they added extra R100 i requested them to remove that R100 coz the was fees in my account n immediately i paid by R210 being adviced by their agent n i loged a call that R100 must be removed with immediate effect .they loged my call ref was .Good Day your reference number 1- ********** ********** thank you Vodacom and Good Day your reference number is 1- ********** ********** Thank you Vodacom but still that R100 its not being removed now they say im in arrears which its not far.

My number is ********** 848 id ********** 569086 please assist to resolve my complain.