Vodacom stinking attitude towards customers is appalling!!!

Vodacom has a lot of *********** bladdy people working in their collections call centre. Who gives the worst service and has the ****tiest attitude with clients on the phone. I changed my bank details via email months ago only to get a warning letter 3 months down the line to say my account is in arrears and on top of that they want to charge me R100 for every debit order that has not gone off. And the bladdy agent on the phone tells me it's not her problem or vodacoms problem ?!!!!!! THIS IS DISGUSTING!!! But Vodacom is quick to call and offer deals but can't provide sufficient customer service!!!!